Concrete modular integrated building connecting system and construction method

Abstract

The invention discloses a concrete modular integrated building connecting system which comprises connection of a plurality of concrete modular box bodies, each concrete modular box body is composed of a prefabricated top plate, a prefabricated bottom plate, a prefabricated beam, a prefabricated shear wall and a prefabricated partition wall, and each concrete modular box body is formed through integral pouring; a reserved post-pouring area is arranged at the joint of every two adjacent box components, and notches are formed in the prefabricated top plates; connecting steel bars are in lap joint with the notches, and concrete post-pouring is conducted after the steel bars are in lap joint; u-shaped notches are formed in the prefabricated beams, upper and lower lap joint steel bars are laid at the U-shaped notches, and the two half sections of the prefabricated beams are connected into a whole after concrete is cast in place; a linear vertical notch is formed in the prefabricated shear wall between every two adjacent box bodies, the rib bodies of the wall bodies are connected in the linear notches, all the box bodies are stably connected through lap joint of the reinforcing steel bars and cast-in-place concrete of the cavities, and the prefabricated shear wall is suitable for high-rise buildings, can reduce the workload of a construction site and has good mechanical performance and anti-seismic performance.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated assembled structures, in particular to a concrete modular integrated building connection system and a construction method. Background Art

[0002] Modular integrated building, also known as MIC, is a more advanced prefabricated building. It is a building form that uses a certain building unit as a prefabricated module, which is prefabricated in the factory and then transported to the construction site for installation. Each unit integrates structure, interior and exterior decoration, electromechanical and other elements, all of which are completed in the factory. The construction site can complete the construction of the entire project by assembling them together through reliable connections, achieving high integration and efficient construction. At present, most traditional modular integrated buildings adopt steel structures, which are mainly used in low-rise buildings. They are connected by bolts, and there are problems such as low node connection strength, complex construction, poor structural integrity and seismic performance. It is necessary to provide a concrete modular box that can form a reliable connection between multiple boxes when connected left and right and between upper and lower layers, so that the structure has good integrity and excellent seismic performance, and can be suitable for high-rise buildings. Summary of the invention

[0003] The purpose of the present invention is to provide a concrete modular integrated building connection system and construction method in view of the deficiencies in the prior art, which is suitable for high-rise buildings, can reduce the workload on the construction site, and has good mechanical properties and seismic resistance.

[0004] The present invention is achieved through the following technical solutions:

[0005] A concrete modular integrated building connection system, including the connection of multiple concrete modular boxes, wherein a single concrete modular box is mainly composed of a prefabricated top plate, a prefabricated bottom plate, a prefabricated beam, a prefabricated adjacent box shear wall, a prefabricated peripheral box shear wall and a prefabricated partition wall, characterized in that: a building is divided into a plurality of standardized prefabricated concrete space modules which are completed and have use functions in a factory, and are spliced ​​into a whole on site through reliable connection technology; reserved cast-in-place openings and overlapping steel bars are set at the connection of adjacent box components, and notches are set on the prefabricated top plate; The notch is overlapped with connecting steel bars, a U-shaped notch is provided in the precast beam, upper and lower overlapping steel bars are laid at the U-shaped notch, and the two halves of the precast beam are connected into one, and the precast adjacent box shear walls are provided with a straight-line cavity, and the horizontal additional bars, horseshoe bars, vertical bars of the wall body, and bite steel bars of the wall are connected at the straight-line cavity, and a reliable connection is formed between each box through the overlapping of the steel bars and the cast-in-place concrete of the notch; circular holes are reserved in the outer shear wall, and after the box is assembled on site, the overlapping steel bars are inserted and concrete is poured to form an integral connection between each box.

[0006] As a further improvement of the technical solution of the invention, the connecting steel bars include a first connecting steel bar extending from the left top plate, a second connecting steel bar extending from the right top plate, and a third connecting steel bar at the groove; the first connecting steel bar is connected to the second connecting steel bar through the third connecting steel bar, and the degree of mutual bonding of the precast panels is improved through the above-mentioned steel bar overlap and the cast-in-place concrete of the L-shaped groove.

[0007] As a further improvement of the technical solution of the invention, the prefabricated bottom plate has horizontal seams reserved in the upper and lower concrete modular boxes, and the upper and lower plates are connected by cast-in-place concrete.

[0008] As a further improvement to the technical solution of the invention, the longitudinal reinforcement extending from the end of the prefabricated beam is connected by a sleeve in the joint groove of the two boxes to improve its overall stability.

[0009] As a further improvement of the technical solution of the invention, horseshoe tendons and horizontal additional tendons are anchored at the shear wall surface of the adjacent prefabricated shear walls. After the two prefabricated shear walls are spliced, interlocking steel bars are placed to form a connection with the vertical tendons of the wall and the horseshoe tendons. The steel bars are connected by welding. Vertical dowel bars are arranged at the upper end of the edge parts of the wall and extend out of the concrete body. The bottom is reserved with a tongue and groove, and the steel bars are overlapped and poured to achieve the connection between the upper and lower boxes. The horseshoe tendons mainly ensure that the sandwich walls will not detach from each other, interlock with each other when subjected to force, and limit the displacement between the interlocking steel bars and the vertical tendons of the wall, so that the structure has good integrity. The steel bars are connected by welding.

[0010] As a further improvement of the technical solution of the invention, the post-cast groove of the prefabricated shear wall of the outer box body is filled with a core of inserted steel bars, which can realize the connection between the upper and lower layers of the prefabricated wall. Through the reserved tongue and groove at the bottom, the steel bars are overlapped and cast, so that the upper and lower layers of the prefabricated wall can be connected. It effectively reduces the post-cast concrete and on-site closing. And it has good seismic performance.

[0011] As a further improvement of the technical solution of the invention, the prefabricated partition walls are directly spliced ​​between adjacent boxes to separate spaces; the prefabricated partition walls, prefabricated top plates, prefabricated bottom plates, and prefabricated shear walls enclose a usable space.

[0012] As a further improvement of the technical solution of the invention, a construction method of a concrete modular integrated building connection system is provided, and the construction method is as follows:

[0013] Step S1, constructing a concrete modular box formwork assembled by a prefabricated top plate, a prefabricated bottom plate, a prefabricated beam, a prefabricated shear wall, and a prefabricated partition wall in a factory, laying steel bars in the cavity of the formwork, and forming a single concrete modular box by integral casting;

[0014] Step S2, transporting the finished concrete modular boxes to the construction site;

[0015] Step S3, positioning the corresponding positions of each concrete modular box and hoisting it;

[0016] Step S4: after the hoisting in step S3 is completed, steel bars are arranged and overlapped at the notches of the top plate, the notches of the beams, and the notches of the shear walls;

[0017] Step S5: After the boxes are assembled and arranged, concrete is poured into the reserved slots to form a reliable connection between the boxes.

[0018] As a further improvement of the technical solution of the invention, in step S3, the module is hoisted according to the design drawings and the pre-planned module hoisting sequence, and a special hoist for the MIC module is used. Two cables are set on the hoist to control the posture adjustment during the hoisting operation. The construction steps are as follows:

[0019] Step S31: Construction of the lower building, and reservation of connecting steel bars;

[0020] Step S32, hoisting the upper box body;

[0021] Step S33, hoisting the second upper box;

[0022] Step S34, installing the shear wall vertical distribution steel bars in the formed cavity;

[0023] Step S35, pouring concrete in the cavity and installing connecting dowels.

[0024] In summary, the present invention has the following beneficial effects:

[0025] The present invention provides a concrete modular integrated building connection structure suitable for high-rise buildings, which can reduce the workload on the construction site, has good mechanical properties and seismic performance, has a high tolerance and a large ability to adjust construction errors, and the concrete modular box effectively solves the problems of low strength in node connection, complex construction, poor structural integrity and seismic performance of traditional modular integrated buildings through the connection method of the present invention. It can greatly reduce the difficulty of construction, has a fast construction speed, and is suitable for space-regular buildings such as apartments and hotels. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional schematic diagram of a concrete modular integrated building connection method provided by the present invention.

[0027] Figure 2 It is a three-dimensional schematic diagram of a prefabricated top plate connection in a concrete modular integrated building connection method provided by the present invention.

[0028] Figure 3The present invention provides a schematic elevation diagram of a concrete modular integrated building connection mode box splicing.

[0029] Figure 4-1 The present invention provides a schematic diagram of the facade after prefabricated beams are connected in a lap connection mode for a concrete modular integrated building.

[0030] Figure 4-2 The present invention provides a schematic diagram of the facade after prefabricated beams are connected in a sleeve connection mode for a concrete modular integrated building.

[0031] Figure 5-1 The present invention provides a plan view of a shear wall connection (sandwich wall) of a concrete modular integrated building connection method.

[0032] Figure 5-2 The present invention provides a plan view of a shear wall connection (cast-in wall) of a concrete modular integrated building connection method.

[0033] Figure 6 The present invention provides a three-dimensional schematic diagram of shear wall connection in a concrete modular integrated building connection method.

[0034] Figure 7 The present invention provides a schematic diagram of a concrete modular integrated building connection method box before construction and assembly.

[0035] Figure 8 The present invention provides a schematic diagram of a concrete modular integrated building connection mode box after construction and assembly.

[0036] Fig. 9 The present invention divides the traditional shear wall into three parts, namely, prefabricated parts on both sides and cast-in-place parts. After the prefabricated parts are hoisted on site, concrete is poured in the middle for connection.

[0037] Fig.10 It is a schematic diagram of the seat slurry construction area of ​​the present invention.

[0038] Fig.11 It is a schematic diagram of modular hoisting construction steps of the present invention.

[0039] The numbers in the figure are:

[0040] 1-concrete modular box; 1.1-precast top plate; 1.2-precast bottom plate; 1.3-precast beam; 1.4-precast adjacent box shear wall; 1.5-precast partition wall; 1.6-circular hole; 1.7-precast outer box shear wall; 6-L-shaped notch; 7-connecting steel bars; 7.1-first connecting steel bars; 7.2-second connecting steel bars; 7.3-third connecting steel bars; 8-horizontal seam; 9-U-shaped notch; 10-lap steel bars; 11-longitudinal bars; 12-I-shaped cavity; 13-horseshoe tendons; 14-horizontal additional bars; 15-biting steel bars; 16-vertical bars of wall; 17-vertical dowel bars; 18-tongue and groove. DETAILED DESCRIPTION

[0041] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0042] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In the present invention, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features; in addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] The following is combined with Figure 1-8 The present invention is described in further detail.

[0046] Reference Figures 1 to 8A concrete modular integrated building connection system includes a connection of multiple concrete modular boxes 1, and a single concrete modular box 1 is mainly composed of a prefabricated top plate 1.1, a prefabricated bottom plate 1.2, a prefabricated beam 1.3, a prefabricated adjacent box shear wall 1.4, a prefabricated outer box shear wall 1.7 and a prefabricated partition wall 1.5, wherein: a building is divided into a number of standardized prefabricated concrete space modules that are completed and have use functions in a factory, and are spliced ​​into a whole on site through reliable connection technology; reserved cast-in-place openings and lap steel bars are set at the connection between adjacent box components, and a concrete modular box 1 is formed by integral casting; a reserved cast-in-place opening is set at the connection between two adjacent box components, and the prefabricated top plate 1.1 is provided with L shaped notch 6; the L-shaped notch 6 is overlapped with a connecting steel bar 7, and concrete is cast in situ after the overlapping steel bars; the precast beam 1.3 is provided with a U-shaped notch 9, and the upper and lower overlapping steel bars 10 are laid at the U-shaped notch 9 to connect the two halves of the precast beam 1.3 into one, and the precast shear wall 1.4 is provided with a straight-line cavity 12, and the horizontal additional bars 14, horseshoe bars 13, vertical bars 16 of the wall body, and bite steel bars 15 of the wall body are connected at the straight-line cavity 12. Through the overlapping of the steel bars and the cast-in-situ concrete in the notch, a reliable connection is formed between each box body, and a circular hole 1.6 is reserved in the outer shear wall. After the box body is assembled on site, the overlapping steel bars 19 are inserted and concrete is poured to form an integral connection between each box body, so as to integrate high-rise housing construction. The present invention provides a concrete modular integrated building connection structure suitable for high-rise buildings, which can reduce the workload on the construction site, has good mechanical properties and seismic performance, has a high tolerance and a large ability to adjust construction errors, and the concrete modular box effectively solves the problems of low strength in node connection, complex construction, poor structural integrity and seismic performance of traditional modular integrated buildings through the connection method of the present invention. It can greatly reduce the difficulty of construction, has a fast construction speed, and is suitable for space-regular buildings such as apartments and hotels.

[0047] Specifically, in this embodiment, the connecting steel bars 7 include a first connecting steel bar 7.1 extending from the left top plate, a second connecting steel bar 7.2 extending from the right top plate, and a third connecting steel bar 7.3 at the notch; the first connecting steel bar 7.1 is connected to the second connecting steel bar 7.2 through the third connecting steel bar 7.3, and the degree of mutual bonding of the precast panels is improved through the above-mentioned steel bar overlap and the cast-in-place concrete of the L-shaped notch 6.

[0048] Specifically, in the present embodiment, the prefabricated bottom plate 1.2 has a horizontal seam 8 reserved in the upper and lower concrete modular boxes, and the upper and lower plates are connected by cast-in-place concrete.

[0049] Specifically, in the present embodiment, the longitudinal reinforcement 11 extending from the end of the prefabricated beam 1.3 is connected by sleeves in the joint grooves of the two boxes to improve the overall stability.

[0050] Specifically, in this embodiment, horseshoe tendons 13 and horizontal additional tendons 14 are anchored at the shear wall surface of the prefabricated shear wall 1.4. After the two prefabricated shear walls 1.4 are spliced, the bite steel bars 15 are placed to form a connection with the vertical tendons 16 of the wall body and the horseshoe tendons 13. The steel bars are connected by welding. Vertical dowel bars 17 are arranged at the upper end of the edge parts of the wall body and extend out of the concrete body. The steel bars are overlapped and poured through the reserved tongue and groove 18 at the bottom to achieve the connection between the upper and lower boxes. The horseshoe tendons 13 mainly ensure that the sandwich walls will not detach from each other, bite each other when subjected to force, and limit the displacement between the bite steel bars 15 and the vertical tendons 16 of the wall body, so that the structure has good integrity. The steel bars are connected by welding.

[0051] Specifically, in this embodiment, the prefabricated partition wall 1.5 is directly spliced ​​between adjacent boxes to separate spaces; the prefabricated partition wall 1.5, the prefabricated top plate 1.1, the prefabricated bottom plate 1.2, and the prefabricated shear wall 1.4 enclose a usable space.

[0052] Specifically, in this embodiment, a construction method of a concrete modular integrated building connection system is as follows:

[0053] Step 1. Divide the box modules in the integrated building. According to the needs and usage functions of the modular integrated building, the box is divided into different modules.

[0054] Step 2. Establish the information model of modular integrated building and calculate the model as a whole. The box is split for in-depth design to obtain the specific function, size and structure of each box.

[0055] Step 3. Build the templates of the prefabricated top plate 1.1, prefabricated bottom plate 1.2, prefabricated beam 1.3, prefabricated shear wall 1.4, and prefabricated partition wall 1.5 in the factory and assemble them into an integral concrete modular box template, lay fixed steel bars in the template cavity, and form a single concrete modular box 1 through integral casting.

[0056] Step 4: transport the finished concrete modular box 1 to the construction site, locate the corresponding position of the box according to its use function, and hoist and place it.

[0057] Step 5. Splice the box body by translation. After splicing, lay steel bars at the notch of the prefabricated top plate 1.1, and overlap the first connecting steel bar 7.1, the second connecting steel bar 7.2, and the third connecting steel bar 7.3 of the top plate. Lay the overlapping steel bars 10 at the U-shaped notch 9 of the prefabricated beam 1.3, so that the longitudinal bars 11 extending from the beam are connected to the overlapping steel bars 10 through the sleeve. After splicing the prefabricated shear wall 1.4, overlap the horseshoe reinforcement 13 and the horizontal additional reinforcement 14 up and down, place the bite reinforcement 15 at the notch to connect the vertical reinforcement 16 of the wall body with the horseshoe reinforcement 13, and the steel bars are connected by welding. The vertical dowel bars 17 are arranged at the upper end of the wall edge parts and extend out of the concrete body, and the tongue and groove 18 is reserved at the bottom.

[0058] Step 6. After the steel bars are laid and overlapped, cast-in-place concrete is poured into the reserved notches of the components to form a reliable connection between each box, which is then assembled into a high-rise building.

[0059] Specifically, in the present embodiment, in step S3, the module is hoisted according to the design drawings and the pre-planned module hoisting sequence, and a special hoist for the MIC module is used. Two cables are set on the hoist to control the posture adjustment during the hoisting operation. The construction steps are as follows:

[0060] Step S31: Construction of the lower building, and reservation of connecting steel bars;

[0061] Step S32, hoisting the upper box body;

[0062] Step S33, hoisting the second upper box;

[0063] Step S34, installing the shear wall vertical distribution steel bars in the formed cavity;

[0064] Step S35, pouring concrete in the cavity and installing connecting dowels.

[0065] Example:

[0066] Modular construction refers to the integration of the entire chain of construction industries, the concentration of superior resources, the use of automated, intelligent, and digital equipment in the factory to produce standardized prefabricated space modules (modular building basic units) with functional use, and finally assembled into highly integrated buildings. The basic unit of modular construction is a standardized space building module that integrates architectural, structural, electromechanical and decoration functions, is prefabricated in the factory, and meets the requirements of transportation, hoisting, testing and maintenance. The MIC module factory is 90% complete, including 98% for external protection, 90% for decoration and 80% for electromechanical, which greatly reduces the workload of on-site workers. The MIC construction method reduces the number of on-site workers by 60% compared with similar projects of the same scale, and at the same time reduces construction waste by 70%, and saves 50% of the construction period. After the product is transported to the construction site, it is directly hoisted, and after the joint nodes are handled, the concrete is poured to complete the floor construction, realizing "building a house like building a car."

[0067] Reference Fig. 9 MIC shear wall is a traditional shear wall that is split into three parts: prefabricated parts on both sides and cast-in-place parts. After the prefabricated parts are hoisted on site, concrete is poured in the middle to connect them. This method has reliable connection and does not require formwork to be set up on the construction site. A lot of work is completed in the factory, greatly improving production efficiency and quality.

[0068] Workshop and yard packaging

[0069] After the MIC module is produced in the workshop, it is covered with canvas. The canvas is cut with notches at the hanging points to expose the hanging points for easy lifting. Before the module is placed outdoors, the columns at the hanging points should be tightly wrapped with waterproof rubber sleeves to avoid water leakage and secret disclosure.

[0070] transportation

[0071] The MIC module must complete relevant quality inspection before leaving the factory, and only the MIC modules that have passed the inspection by the quality control department can be shipped.

[0072] (1) Transport, loading and unloading, and stacking equipment Transport vehicles and equipment tools: flatbed trailers, transport racks, rubber pads, fixing bandages, flexible gaskets, etc. Loading and unloading and stacking equipment: cranes, special lifting equipment for prefabricated parts, stacking racks, rubber pads, pads, wooden blocks, etc.

[0073] (2) Before transportation, the prefabricated component factory should organize drivers, safety officers and other relevant personnel to inspect the conditions of the transportation roads (including whether there are obstacles along the way, the allowable load of the highway bridge, the clearance size of the culvert, etc.); combine the network map to plan the transportation route and select it. The transportation route should be highways as much as possible, avoiding narrow and crowded urban roads. Before the components are officially shipped out of the factory, select vehicles of the same specifications for empty vehicle test runs to familiarize yourself with the road conditions in advance.

[0074] (3) When the MIC modules leave the factory, the module numbers must be marked one by one, and the lengths of the hoist wire ropes and manual hoist steel chains must be recorded for each module when they are loaded onto the vehicle. The modules must be provided to the project department along with the vehicle for reference during hoisting at the construction site.

[0075] Line positioning

[0076] According to the design drawings, a laser level is used to project the MIC module hoisting contour line, the mortar construction range line and the 300mm control inspection line on the floor (make corresponding marks to avoid confusion during hoisting), and use a marker to mark the MIC module number and related information on the outside of the contour line. At the same time, the floor elevation control line is drawn out using the wire hole, and red paint is used to mark the inserted reinforcement 200mm away from the finished surface of the floor for elevation positioning during subsequent MIC module hoisting.

[0077] Lower concrete elevation control and limit installation

[0078] Use the building elevation line to check the concrete floor elevation of the planned hoisting area one by one, and grind the concrete at the super-elevated position. After the elevation is verified, place plastic gaskets (fixed on the ground with nails, 40*40*2~10mm thick, 2 batches, 100 pieces per batch, and replenish in time if insufficient) at all the dowel positions of the MIC module (about 50mm away from the dowel, supported on the side wall of the steel pipe column) to adjust the elevation. Place two at each dowel position, and the outer plastic gaskets must not exceed the wall line to ensure that the elevation of the MIC module meets the design requirements after installation (in principle, the overall height of the plastic gasket is 20mm, and the specific height is subject to the actual floor elevation of the construction site).

[0079] Seat slurry construction

[0080] Reference Fig.10 , combined with the actual hoisting time of the MIC module, configure the MIC module special C60 material. The seat slurry should be mixed with water and material as required and stirred evenly, and it is required to adapt to the actual hoisting progress on site to ensure that the seat slurry has not initially solidified when the MIC module is hoisted into place.

[0081] After the base slurry is mixed, it is spread with an iron trowel. The slurry is laid along the outline of the MIC module with a width of 180mm and a height of about 8mm (about 28mm) higher than the elevation control gasket. The base slurry at the elevation gasket position should be reinforced, and the slurry at the elevation control gasket should not cover the elevation control gasket. The middle bottom plate area of ​​the MIC module is constructed with 300*300mm, 20mm thick pancake-shaped base slurry blocks with a center spacing of 810mm.

[0082] M15 mortar is used for mortar construction in the middle bottom plate area of ​​adjacent MIC modules, and the mortar area is constructed with long strip mortar blocks along the bottom frame of the MIC module.

[0083] It is important to note that during the construction of the mortar layer, surveyors need to be arranged to measure the mortar laying elevation and control the height of the finished surface of the mortar to avoid leakage during subsequent concrete pouring. At the same time, special attention should be paid to the coordination between the mortar layer construction and the MIC module hoisting. When the MIC module is ready to be hoisted, the mortar layer construction of the pre-hoisting area should be started on the working surface. The module hoisting must be completed before the mortar is initially set.

[0084] MIC module hoisting and connection concrete pouring

[0085] Reference Fig.11 The lifting is carried out according to the design drawings and the pre-planned module lifting sequence, and a special lifting device for the MIC module is used. Two cables and wind ropes are set on the lifting device to control the posture adjustment during the lifting operation.

[0086] The construction steps are as follows:

[0087] (1) Construction of the lower building, with reserved connecting steel bars;

[0088] (2) Lifting of upper box 1;

[0089] (3) Lifting of upper box 2;

[0090] (4) Install the shear wall vertical distribution steel bars in the formed cavity;

[0091] (5) Pour concrete into the cavity and install connecting bars;

[0092] This system building uses self-compacting concrete and fine stone concrete for concrete pouring. When pouring walls, a vibrating rod should be used for vibration. During vibration, every three wave peaks are a vibration point. The vibration time is about 10S, and it is required to be inserted quickly and pulled out slowly. Concrete pouring should try to avoid high temperature periods. If it cannot be avoided, the temperature of concrete entering the mold should not exceed 35℃. When the water evaporation rate is too fast, wind blocking and sun shading measures should be taken on the construction surface.

[0093] In this project, the concrete of the columns and shear walls is poured layer by layer and continuously. The amount is controlled according to the pouring height of 1000mm. A single area is a layered pouring section, and the second layer of concrete should be poured before the initial setting of the previous layer of concrete. During the pouring process, a special person is assigned to watch the mold and deal with any abnormal conditions such as leakage and mold expansion in a timely manner.

[0094] Measuring and setting out

[0095] Key points of operation: According to the requirements of the design drawings, use a total station to project the MIC module hoisting outline, the seat mortar construction range line and the 300mm control inspection line on the floor (make corresponding marks to avoid confusion during hoisting).

[0096] Notes: 1. The design unit shall separately issue the MIC module positioning diagram to the construction unit for positioning line projection preparation;

[0097] 2. The control line should be projected according to the module structure line (steel column positioning line). Some modules may have inconsistent decoration surfaces, and projecting the control line according to the decoration surface is prone to errors;

[0098] 5.2 Installation of elevation control gasket

[0099] Key points of operation: After the elevation is verified, place plastic spacers (fixed on the ground with mortar) at all dowel positions of the MIC module (about 50mm away from the dowel, supported on the side wall of the steel pipe column) to adjust the elevation. Place 1 to 2 spacers at each dowel position, and the outer plastic spacers must not exceed the wall line.

[0100] Notes: 1. The number of gaskets must be sufficient. When there is no dowel on one side of the box, an elevation control gasket should also be set on that side. There are some parts of the construction site where the box is not flat due to insufficient control gaskets;

[0101] 2. When installing the gasket, use slurry to assist in fixing it to prevent the elevation control gasket from slipping during the falling and alignment of the box, thereby affecting the elevation control of the box;

[0102] Seat mortar construction

[0103] Key points of operation: The seat slurry is laid along the outline of the MIC module, with a width of 180mm and a height of about 8mm higher than the elevation control gasket. The seat slurry at the elevation gasket position should be reinforced, and the slurry laid at the elevation control gasket should not cover the elevation control gasket;

[0104] Mortar is used for the mortar construction in the middle bottom plate area of ​​the MIC module. The mortar area is arranged along the purlin of the bottom frame of the MIC module to form pancake-shaped mortar blocks with a spacing of about 300mm. The height of the mortar is controlled to be 8mm (about 28mm) above the design elevation.

[0105] Note: 1. Pay special attention to not mixing the mortar materials in the wall column and base plate area, otherwise it will affect the structural force; and the relevant materials should be equipped as needed, and it is strictly forbidden to use them beyond the expiration date;

[0106] 2. The mortar in the middle of the board can be constructed with a fixed mold, which is convenient for improving the overall construction efficiency. The refined construction is beneficial to the stress of the purlins at the bottom of the board and can reduce the hollow feeling at the bottom of the board;

[0107] 3. There are many uncertain factors in the hoisting of MIC modules. It is recommended to carry out the mortar filling under the shear wall after hoisting to ensure that the mortar filling material has not completely hardened when the module is in place.

[0108] Box hoisting

[0109] Key points of operation: Perform hoisting according to the design drawings and the pre-planned module hoisting sequence, and use special hoists for MIC modules. Guy ropes are set on the hoists to control the posture adjustment during the hoisting operation.

[0110] Note: 1. The MIC module lifting equipment at the construction site should be consistent with the lifting equipment used in the factory, and both should be manufactured, tested and provided by the factory;

[0111] 2. When the MIC module leaves the factory, the length of the manual hoist steel chain when it is transported to the vehicle needs to be recorded for each module, which will be used as a reference for leveling when hoisting on the construction site;

[0112] 3. When lifting the box, the secondary transfer should be minimized to avoid deformation of the box during repeated lifting;

[0113] 4. Before the formal hoisting, the construction conditions of the working surface and the MIC module should be reviewed as a whole, with a focus on the positioning of the work surface reinforcement, whether the external frame invades the module hoisting range, whether the shear wall reinforcement is within the control line range, and whether there is concrete blockage at the bottom of the MIC module steel column and shear wall.

[0114] 5. The MIC module is slowly lifted until it is slightly off the ground. The lifting equipment and the module are stabilized with the cable wind rope, and the lifting rope is adjusted again to make the module level. The module is lifted and left to stand at 0.5m above the ground. After it is stable, it is slowly lifted again. The MIC module is lifted to about 1m above the working board surface. After manual assistance, it is slowly and steadily lowered to allow the steel pipe column of the MIC module bottom plate to fit the steel pipe dowel extending from the top of the lower MIC module according to the positioning. The module is left to stand again at 50mm to start precise alignment.

[0115] 6. The MIC module must be hoisted along the line. If there is a large deviation from the positioning line, arrange to hoist it again and install it again;

[0116] 7. In case of rain, cover the box with a tarpaulin after the box is hoisted to prevent water accumulation in the rebars and shear walls.

[0117] Seam treatment

[0118] Key points: The horizontal joint (120mm) on the top of the MIC module top plate is connected to the steel beam using a 2mm thick steel plate on the floor deck; the vertical joint width of the MIC module facade is 40 / 60mm, and is reinforced in the form of cement fiberboard + water stop screws;

[0119] Note: 1. It is forbidden to use foam glue to connect the top joints. If there are joints, M10 cement mortar must be used to seal them.

[0120] Concrete pouring

[0121] Key points of operation: Since the gaps in the MIC module system concrete pouring are small, self-compacting concrete is used for concrete pouring, and a small vibrating rod with a diameter of 30mm should be used for concrete vibration.

[0122] Notes: 1. Investigate the self-compacting concrete supplier in advance and conduct performance tests on relevant mix ratios in advance to ensure high-quality concrete technology at the construction site;

[0123] 2. As the facade work of MIC products is basically completed when they leave the factory, special attention should be paid to the protection of the finished concrete during the concrete pouring process. It is recommended to use concrete guide grooves to pour the shear walls on the exterior walls.

[0124] 3. The concrete construction of MIC modules includes concrete pouring of square columns, concrete pouring of shear walls, and concrete pouring of floor slabs. Since the corrugated steel plate wall and the decoration are completed when the MIC modules arrive at the project, the density of the concrete pouring cannot be seen. Therefore, the vertical concrete pouring of the MIC modules is controlled by the total amount method. Before pouring the vertical concrete, the volume of concrete to be poured is calculated. The actual amount of concrete poured during pouring shall not exceed 3% of the previously calculated volume.

[0125] 4. Use self-compacting concrete / fine stone concrete for pouring, and set holes with a diameter of 130mm every 150mm in the cavity for vibrating with a vibrating rod. During the pouring process, tap the corrugated steel plate to listen to the sound to determine whether it is dense, and use ultrasonic scanning to detect the density of the concrete.

[0126] The quasi-static test was carried out using two sandwich shear walls of specimens ZCJXQ-1 and ZCJXQ-2 and a cast-in-place shear wall of 250ZCXJQ:

[0127] Comparative analysis of carrying capacity

[0128] It can be seen from Table 1 that the cracking load of the sandwich shear wall is equal to that of the cast-in-place shear wall. The average horizontal yield load of the sandwich shear wall is 1462.82 kN, which is 9.34% lower than the average yield load of the cast-in-place shear wall of 1613.46 kN. The average horizontal ultimate load of the sandwich shear wall is 1968.41 kN, which is 7.63% lower than the average ultimate load of the cast-in-place shear wall of 2130.95 kN. The average failure load of the sandwich shear wall is 1673.15 kN, which is 7.63% lower than the average failure load of the cast-in-place shear wall of 1811.30 kN. The difference between the average values ​​of the yield load, ultimate load and failure load of the sandwich shear wall and the cast-in-place shear wall is within 10%, which shows that the sandwich shear wall has a bearing capacity similar to that of the cast-in-place shear wall.

[0129] Table 1. Horizontal force of specimens in different states (kN)

[0130]

[0131] The ductility of a component is used to measure the deformation capacity of a structure or component, and is also an important indicator for measuring the seismic performance of a structure. The ductility coefficient is often used to represent the ductility. The displacement ductility coefficient is μ = Δ μ / Δ y , Δ μ is the failure displacement, Δ y is the yield displacement. The cracking displacement of the specimen Δ cr (Yield displacement angle θ cr ), yield displacement Δ y (Yield displacement angle θ y ), limit displacement Δ p (Limit displacement angle θ p ), failure displacement Δ μ (Failure displacement angle θ u ) and displacement ductility coefficient μ are shown in Table 2.

[0132] Table 2, Deformation capacity of specimens

[0133]

[0134] It can be concluded from Table 2 that the yield displacement, ultimate displacement and failure displacement of the two sandwich shear wall specimens are basically the same, but all are smaller than the cast-in-place shear wall. The sandwich shear wall is assembled by two "L"-shaped walls through the post-casting of the middle concrete. During the force-bearing process, the overall structure shows a large initial stiffness when bearing loads. Since the connecting steel bars between the two "L"-shaped walls are relatively weak, after cracks appear in the wall, the overall stiffness will decrease slightly faster than the cast-in-place concrete wall, and the overall deformation capacity will be weakened. From the perspective of ductility coefficient, the difference in ductility coefficients of the two sandwich shear walls is 1.39%, and the average ductility coefficient of the sandwich shear wall is 2.18, which is 2.75% lower than the average ductility coefficient of the cast-in-place shear wall of 2.24, indicating that the ductility coefficients of the sandwich shear wall and the cast-in-place shear wall are equivalent.

[0135] Through the quasi-static test of three shear walls of specimens ZCJXQ-1, ZCJXQ-2 and 250ZCXJQ, the mechanical properties of sandwich shear wall specimens were studied, and the following conclusions were obtained:

[0136] Bearing capacity: The bearing capacity of sandwich shear wall is slightly lower than that of cast-in-place shear wall. Its average yield load and average ultimate load are 9.34% and 7.63% lower than those of cast-in-place shear wall respectively, and the difference is within 10%.

[0137] Deformation and ductility: The yield displacement, ultimate displacement and failure displacement of the sandwich shear wall specimen are all smaller than those of the cast-in-place shear wall, but its ductility coefficient reaches 2.16, which is only slightly lower than that of the cast-in-place shear wall by 3%, and it can still maintain good deformation tolerance.

[0138] The sandwich shear wall is composed of two prefabricated "L"-shaped walls assembled together by post-casting concrete in the middle, and the overall structure shows a large initial stiffness. After the ultimate load, the sandwich shear wall can slow down the further degradation of the overall strength through the bite and friction between the walls. Compared with the cast-in-place shear wall, the bearing capacity of the sandwich shear wall is basically the same; the yield displacement, ultimate displacement and failure displacement are smaller than the cast-in-place shear wall, but its ductility coefficient is equivalent to that of the cast-in-place shear wall, and it has good deformation tolerance; at the same time, the single-circuit energy consumption, cumulative energy consumption and equivalent viscous damping coefficient all exceed the cast-in-place shear wall, showing better energy dissipation capacity, which helps to improve the seismic resistance of the structure.

[0139] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A concrete modular integrated building connection system, comprising the connection of a plurality of concrete modular boxes (1), wherein a single concrete modular box is mainly composed of a prefabricated top plate (1.1), a prefabricated bottom plate (1.2), a prefabricated beam (1.3), a prefabricated adjacent box shear wall (1.4), a prefabricated peripheral box shear wall (1.7) and a prefabricated partition wall (1.5), characterized in that: A building is divided into a number of standardized prefabricated concrete space modules that are manufactured in a factory and have functional functions, and are assembled into a whole on site through reliable connection technology; reserved cast-in-place openings and overlapping steel bars are set at the connection points of adjacent box components, the prefabricated top plate (1.1) is provided with a notch (6); the notch (6) is overlapped with a connecting steel bar (7), the prefabricated beam (1.3) is provided with a U-shaped notch (9), and upper and lower overlapping steel bars (10) are laid at the U-shaped notch. ), the two halves of the precast beams are connected into one, the adjacent precast box shear walls (1.4) are provided with a straight cavity (12), the horizontal additional reinforcement, horseshoe reinforcement, vertical reinforcement of the wall body, and interlocking reinforcement of the wall are connected at the straight cavity, and a reliable connection is formed between each box through the overlap of the reinforcement and the cast-in-place concrete of the groove; a circular hole (1.6) is reserved in the outer shear wall, and after the box is assembled on site, the overlap reinforcement (19) is inserted and concrete is poured to form an integral connection between each box.

2. A concrete modular integrated building connection system according to claim 1, characterized in that: The connecting steel bars (7) include a first connecting steel bar (7.1) extending from the left top plate, a second connecting steel bar (7.2) extending from the right top plate, and a third connecting steel bar (7.3) at the notch; the first connecting steel bar (7.1) is connected to the second connecting steel bar (7.2) via the third connecting steel bar (7.3).

3. The concrete modular integrated building connection system according to claim 1, characterized in that: The prefabricated bottom plate (1.2) has horizontal seams (8) reserved in the upper and lower concrete modular boxes.

4. The concrete modular integrated building connection system according to claim 2, characterized in that: The longitudinal reinforcement (11) extending from the end of the prefabricated beam is connected in the splicing grooves of the two boxes by using sleeves.

5. The concrete modular integrated building connection system according to claim 1, characterized in that: Horseshoe reinforcement (13) and horizontal additional reinforcement (14) are anchored at the shear wall surface of the prefabricated adjacent box shear wall (1.4). After the two prefabricated shear walls are spliced, the interlocking reinforcement (15) is placed to form a connection with the vertical reinforcement (16) of the wall body and the horseshoe reinforcement (13). The reinforcements are connected to each other by welding. Vertical dowels (17) are arranged at the upper end of the wall edge component and extend out of the concrete body. The tongue and groove (18) is reserved at the bottom, and the reinforcements are overlapped and poured to achieve the connection between the upper and lower boxes.

6. The concrete modular integrated building connection system according to claim 1, characterized in that: The shear wall body of the prefabricated outer box shear wall (1.7) is provided with a full-height core grouting space (1.6), and steel bars are inserted and overlapped and then cast (19) to achieve the connection between the upper and lower box bodies; vertical dowel bars (17) are arranged at the upper end of the wall edge member and extend out of the concrete body, and a tongue and groove (18) is reserved at the bottom, and steel bars are overlapped and then cast to achieve the connection between the upper and lower box bodies.

7. The concrete modular integrated building connection system according to claim 1, characterized in that: The prefabricated partition wall (1.5) is directly spliced ​​between adjacent boxes to separate spaces; the prefabricated partition wall (1.5) is enclosed with a prefabricated top plate (1.1), a prefabricated bottom plate (1.2), and prefabricated adjacent box shear walls (1.4) to form a usable space.

8. A construction method of a concrete modular integrated building connection system, which is implemented based on a concrete modular integrated building connection system according to any one of claims 1 to 6, characterized in that: The construction method is as follows: Step S1, constructing a concrete modular box formwork assembled by a prefabricated top plate (1.1), a prefabricated bottom plate (1.2), a prefabricated beam (1.3), a prefabricated adjacent box shear wall (1.4), and a prefabricated partition wall (1.5) in a factory, laying steel bars in the cavity of the formwork, and forming a single concrete modular box through integral casting; Step S2, transporting the finished concrete modular boxes to the construction site; Step S3, positioning the corresponding positions of each concrete modular box and hoisting it; Step S4: after the hoisting in step S3 is completed, steel bars are arranged and overlapped at the notches of the top plate, the notches of the beams, and the notches of the shear walls; Step S5: After the boxes are assembled and arranged, concrete is poured into the reserved slots to form a reliable connection between the boxes.

9. The construction method of a concrete modular integrated building connection system according to claim 8, characterized in that: In step S3, the module is hoisted according to the design drawings and the pre-planned module hoisting sequence, and a special hoist for the MIC module is used. Two cables are set on the hoist to control the posture adjustment during the hoisting operation. The construction steps are as follows: Step S31: Construction of the lower building, and reservation of connecting steel bars; Step S32, hoisting the upper box body; Step S33, hoisting the second upper box; Step S34, installing the shear wall vertical distribution steel bars in the formed cavity; Step S35, pouring concrete in the cavity and installing connecting dowels.

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