Prefabricated concrete hollow wall anti-expansion mold device and construction technology

Abstract

The present invention belongs to the technical field of prefabricated buildings, and particularly relates to a prefabricated concrete hollow wall anti-expansion formwork device and construction process. The device includes a hollow wall and a pressure beam assembly, wherein the pressure beam assembly includes a plurality of bottom pressure beams, and the plurality of bottom pressure beams are arranged on the outside of the prefabricated wall panels of the hollow wall, and are connected to the tension bolt group of the hollow wall. The bottom pressure beam is an I-shaped structure, including a flange plate I, a web plate and a flange plate II, wherein the flange plate I and the flange plate II are arranged in parallel, and the web plate is vertically connected between the flange plate I and the flange plate II; the web plate is parallel to the prefabricated wall panel, and a plurality of connection holes for connecting with the tension bolt group are provided on the web plate in the length direction. The present invention requires less equipment investment, is quick to take effect, reduces unnecessary reinforcement in the cavity, and reduces product cost.

Description

Technical Field

[0001] The invention belongs to the technical field of assembled buildings, and in particular relates to a precast concrete hollow wall anti-expansion formwork device and a construction process. Background Art

[0002] With the rapid development of the construction industrialization process, the demand for prefabricated concrete components has increased year by year. In prefabricated buildings, shear wall structures account for the largest proportion and are the most complex in technology. In the existing specifications, shear walls are divided into two types: solid shear walls and hollow shear walls (also known as double-sided composite shear walls, hollow walls); solid shear walls can only rely on the "sleeve grouting" process to connect the upper and lower force-bearing steel bars, which has great uncertainty in operation and connection quality, so they are gradually faded out of the prefabricated building market. Hollow walls are also called assembled integral double-sided composite shear walls. They are composed of inner and outer page walls and cavities. They are prefabricated in the factory, transported to the construction site, and connected to the cavity. Steel bars are placed and concrete is poured, so that the wall structure is fully connected up and down and left and right to form the vertical force system of the building. Compared with solid shear walls, hollow walls have the advantages of easy production, reliable connection of force-bearing steel bars, excellent seismic performance, and easy installation.

[0003] The manufacturing process of hollow walls is now very mature, mainly the inverted insertion process and the bolt group connection process. In practical applications, the biggest problem is the "expansion mold problem" when pouring concrete in the cavity. The so-called "expansion mold" means that during the secondary pouring of the precast concrete hollow wall, the hollow wall panel "expands and cracks" due to the lateral pressure of the "fluid" concrete, which makes the entire wall unable to form a stable load-bearing body.

[0004] Figure 1 Schematic diagram of the hollow wall structure connected by bolt groups; Figure 1 As shown, the hollow wall includes two parallel prefabricated wall panels 1 and a plurality of tension bolt groups 2 connecting the two prefabricated wall panels 1. There is a cast-in-place cavity 3 between the two prefabricated wall panels 1. The two prefabricated wall panels 1 are prefabricated and assembled in the factory and equipped with stress-bearing steel bars. The tension bolt group 2 locks the two prefabricated wall panels 1 to ensure the stability of the positions of the two prefabricated wall panels 1. The cast-in-place cavity 3 is in a cavity state when it leaves the prefabrication factory. After it is transported to the construction site, concrete is poured into the cast-in-place cavity 3 and forms the final stress-bearing wall with the prefabricated wall panels 1.

[0005] Technical defects of existing processes:

[0006] Inverted connection process "hollow wall": In order to prevent the problem of cast-in-place mold expansion, this process is mainly carried out in the following ways:

[0007] Increase the connection density of truss bars and steel mesh: that is, to prevent the problem of mold expansion during cast-in-place casting, increase the amount of connecting steel bars; increase the thickness of precast concrete panels: as the thickness of the concrete panels increases, their ability to resist mold expansion will naturally increase. The problems brought about by the two methods are: the cost of the project has increased significantly, and at the same time, the increase in precast thickness is not allowed by relevant regulations. (For example, the total thickness required by the domestic shear wall specification is 200mm. If it is made into a hollow wall, it can only be 50mm precast inner wall + 100mm cavity + 50mm precast outer wall) and the 50mm precast hollow wall, in order to prevent mold expansion, the spacing between the two leaves of the wall should be ≤500mm.

[0008] In order to prevent the problem of mold expansion during cast-in-place construction, a large amount of structural steel bars are used, and the overall project cost is extremely high. This process also has a series of problems such as large equipment investment, unsafe transportation and hoisting, and the inability to repair the mold once it expands.

[0009] The bolt group connection process "hollow wall" has the advantages of simple manufacturing process, low equipment investment, high production efficiency, greatly reduced cost, safe and stable transportation and hoisting. Compared with the inverted insertion process, it has great advantages and promotion value. However, there are still some insurmountable shortcomings: because it is a point-type tie, if the tie points are increased, it will cause inconvenience in manufacturing and construction, and there will be many holes that need post-processing. Summary of the invention

[0010] In view of the above problems, the object of the present invention is to provide a precast concrete hollow wall anti-expansion formwork device and a construction process.

[0011] In order to achieve the above object, the present invention adopts the following technical solutions:

[0012] A precast concrete hollow wall anti-expansion formwork device comprises a hollow wall and a pressure beam assembly, wherein the pressure beam assembly comprises a plurality of bottom pressure beams, the plurality of bottom pressure beams are arranged on the outside of the precast wall panels of the hollow wall and connected to the tension bolt group of the hollow wall.

[0013] The bottom compression beam includes a flange plate I, a web plate and a flange plate II, wherein the flange plate I and the flange plate II are arranged in parallel, and the web plate is vertically connected between the flange plate I and the flange plate II; the web plate is parallel to the prefabricated wall panel, and a plurality of connection holes for connecting with the tension bolt group are provided on the web plate along the length direction.

[0014] The connecting hole is an elliptical hole;

[0015] The tension bolt group includes a T-shaped screw, a gasket and a fixing nut, wherein the T-shaped screw is inserted into the elliptical hole and is locked by the gasket and the fixing nut.

[0016] The compression beam assembly also includes at least one second-layer compression beam and a cushion beam connected to the second-layer compression beam. The second-layer compression beam is arranged on the outside of the bottom-layer compression beam and is connected to at least two of the bottom-layer compression beams; the cushion beam is located on the inside of the second-layer compression beam and is in contact with the prefabricated wall panel.

[0017] The two-layer compression beams include two-layer long compression beams and / or two-layer short compression beams, wherein the two-layer long compression beams are used to connect more than two of the bottom layer compression beams; the two-layer short compression beams are used to connect two adjacent bottom layer compression beams;

[0018] The structures of the second-layer long compression beam and the second-layer short compression beam are the same as the structure of the bottom-layer compression beam, and the webs are parallel to the prefabricated wall panels.

[0019] The compression beam assembly also includes a sealing plate, which is connected to the second-layer compression beam and is used to seal the holes and embedded parts on the prefabricated wall panels.

[0020] The sealing plate comprises an end plate and a sealing beam arranged on the end plate, wherein the sealing beam is connected to the second layer compression beam, and the end plate is fitted with the prefabricated wall panel.

[0021] The structure of the sealing beam is the same as that of the bottom layer compression beam; and the web plate is parallel to the end plate.

[0022] A construction process of the precast concrete hollow wall anti-expansion formwork device as described above, wherein the construction process comprises the following steps:

[0023] 1) Install bottom compression beams symmetrically on the outside of the two prefabricated wall panels of the hollow wall, and connect the bottom compression beams with the tension bolt group of the hollow wall;

[0024] 2) Connect the cushion beam to the second-layer compression beam through connecting bolts;

[0025] 3) Connect the second-layer compression beam connected with the cushion beam to the bottom-layer compression beam, and the cushion beam abuts against the prefabricated wall panel;

[0026] 4) Connect the sealing plate to the second layer of compression beam;

[0027] 5) Connect the second-layer compression beam connected with the sealing plate to the bottom-layer compression beam, so that the sealing plate fits the hollow position of the prefabricated wall panel;

[0028] 6) pouring concrete in the cast-in-place cavity of the hollow wall;

[0029] 7) After curing and forming, remove the following parts separately: second-layer compression beam, cushion beam, sealing plate, bottom-layer compression beam and tension bolt group.

[0030] In step 1), the flange plate I and the flange plate II of the bottom compression beam are in vertical contact with the prefabricated wall panel, and the web plate is parallel to the prefabricated wall panel;

[0031] In step 2), the cushion beam and the webs in the second layer compression beam are connected to each other;

[0032] In step 3), the webs of the second layer compression beams are parallel to the prefabricated wall panels;

[0033] In step 4), the sealing beam of the sealing plate is connected to the second layer compression beam;

[0034] In step 5), the end plate of the sealing plate is fitted to the position of the prefabricated wall panel where the hole is.

[0035] The advantages and beneficial effects of the present invention are:

[0036] The invention has low equipment investment and quick effect. It can be easily transformed with existing equipment, giving full play to the hollow wall application advantage of the "tension bolt connection process", reducing unnecessary reinforcement in the cavity and reducing product cost; solving the problem of rough surface of the inner cavity, better engaging and connecting with the cast-in-place concrete of the cavity, eliminating the hidden safety hazards of wall stress; solving the problem of reinforcement on the side of the wall panel, making the overall stress more sufficient and reducing the project cost; improving the overall accuracy of the hollow wall, making the building as a whole more aesthetically pleasing; and enabling the hollow wall to be manufactured with an insulation layer;

[0037] The present invention reduces unnecessary auxiliary steel bars during the manufacturing and transportation process, and only needs to ensure the safety of manufacturing, transportation and hoisting, that is, the prefabricated hollow wall components shipped from the factory can be transported to the construction site according to national standards.

[0038] During the on-site pouring process, the present invention strengthens the anti-"mold expansion" measures during the secondary pouring. As long as the "mold expansion" measures of one layer are well done, the mold expansion measures can be reused layer by layer. The anti-mold expansion measures are simplified, standardized, universal, and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of a hollow wall structure connected by bolt groups;

[0040] Figure 2 for Figure 1 Side view of

[0041] Figure 3 This is a schematic structural diagram of a precast concrete hollow wall anti-expansion formwork device in Embodiment 1 of the present invention;

[0042] Figure 4 It is a structural schematic diagram of the bottom layer compression beam in the present invention;

[0043] Figure 5 for Figure 4 AA section view;

[0044] Figure 6 It is a schematic diagram of the structure of the T-bolt in the present invention;

[0045] Figure 7 This is a schematic diagram of the structure of the precast concrete hollow wall anti-expansion formwork device in the second embodiment of the present invention;

[0046] Figure 8 It is a schematic diagram of the connection between the bottom layer compression beam and the second layer compression beam in the present invention;

[0047] Fig. 9 It is a schematic diagram of the connection between the cushion beam and the second-layer compression beam in the present invention;

[0048] Fig.10 This is a schematic diagram of the structure of the precast concrete hollow wall anti-expansion formwork device in the third embodiment of the present invention;

[0049] Fig.11 It is a structural schematic diagram of the sealing plate in the present invention;

[0050] Fig.12 for Fig.11 Left view of

[0051] Fig.13 It is a schematic diagram of the connection between the sealing plate and the second layer compression beam in the present invention.

[0052] In the figure: 1 is a prefabricated wall panel, 2 is a tension bolt group, 201 is a T-type screw, 202 is a gasket, 203 is a fixing nut, 3 is a cast-in-place cavity, 4 is a bottom layer compression beam, 401 is a flange plate I, 402 is a web plate, 403 is a connecting hole, 404 is a flange plate II, 5 is a cushion beam, 6 is a second-layer long compression beam, 7 is a connecting bolt, 8 is a sealing plate, 801 is a sealing beam, 802 is an end plate, and 9 is a second-layer short compression beam. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] Embodiment 1

[0055] like Figure 3 As shown, a precast concrete hollow wall anti-expansion mold device provided in Embodiment 1 of the present invention comprises a hollow wall and a pressure beam assembly, wherein the hollow wall comprises two parallel precast wall panels 1 and a plurality of tension bolt groups 2 connecting the two precast wall panels 1, and a cast-in-place cavity 3 is formed between the two precast wall panels 1. Figure 1-2 The compression beam assembly includes a plurality of bottom compression beams 4, which are arranged outside two prefabricated wall panels 1 of the hollow wall and connected to the tension bolt group 2 of the hollow wall.

[0056] In the embodiment of the present invention, the bottom compression beams 4 on the two prefabricated wall panels 1 are symmetrically arranged, and the multiple bottom compression beams 4 on one side are parallel to each other. This method changes the point connection of the two prefabricated wall panels 1 into a line connection, greatly enhancing the anti-expansion mold capacity of the hollow wall. It should be noted that the bottom compression beams 4 on one side can also be arranged tilted, and the specific layout direction can be set according to the specific situation.

[0057] When installing the bottom compression beam 4, it can be fixed with the original tension bolt group 2 of the hollow wall, giving full play to the hollow wall application advantage of the tension bolt connection process, reducing unnecessary reinforcement in the cavity, and reducing product cost; improving the overall accuracy of the hollow wall, making the building as a whole more aesthetically pleasing, and enabling the hollow wall to be manufactured with an insulation layer.

[0058] like Figure 4-5 As shown, in the embodiment of the present invention, the bottom compression beam 4 includes a flange plate I 401, a web plate 402 and a flange plate II 404, wherein the flange plate I 401 and the flange plate II 404 are arranged in parallel, the web plate 402 is vertically connected between the flange plate I 401 and the flange plate II 404, and a plurality of connection holes 403 for connecting with the tension bolt group 2 are arranged along the length direction on the web plate 402. During installation, the flange plate I 401 and the flange plate II 404 are vertically contacted with the prefabricated wall panel 1, the web plate 402 is parallel to the prefabricated wall panel 1, and the connection holes 403 on the web plate 402 are connected with the tension bolt group 2.

[0059] like Figure 6 As shown, in the embodiment of the present invention, the tension bolt group 2 includes a T-shaped screw 201, a washer 202 and a fixing nut 203, wherein the T-shaped screw 201 passes through the connection hole 403 and is locked by the washer 202 and the fixing nut 203. Further, the connection hole 403 on the web 402 is an elliptical hole, and the T-shaped screw 201 is twisted 90 degrees after passing through the elliptical hole, that is, the head of the T-shaped screw 201 is in a vertical state with the elliptical hole for axial limitation, and then forms a locking state through the washer 202 and the fixing nut 203.

[0060] In the embodiment of the present invention, the bottom compression beam 4 is an I-shaped structure, and the connection and locking position of the tension bolt group 2 is on the web 402, which will not affect the normal operation of the fixing nut 203 of the hollow wall. The bottom compression beam 4 is the focus of the subsequent anti-expansion measures, wherein the flange plate I 401 and the flange plate II 404 are force-bearing components, and their ends are attached to the outer surface of the prefabricated wall panel 1, forming a linear support, which enhances its anti-expansion mold ability. In this embodiment, the bottom compression beam 4 is made of high-rigidity hard materials such as metal and plastic. In addition to the I-shaped, it can also be square, etc., and its cross-sectional size is determined by the calculation stiffness requirements.

[0061] Embodiment 2

[0062] like Figure 7-9 As shown, based on the above embodiment, the compression beam assembly includes multiple bottom-layer compression beams 4, and also includes at least one second-layer compression beam and a cushion beam 5 connected to the second-layer compression beam. The second-layer compression beam is arranged on the outside of the bottom-layer compression beam 4 and is connected to at least two bottom-layer compression beams 4; the cushion beam 5 is located on the inside of the second-layer compression beam and is in contact with the prefabricated wall panel 1.

[0063] In this embodiment, the cushion beam 5 is arranged between two adjacent bottom compression beams 4 to overcome the problem of local mold expansion due to the large spacing between the two bottom compression beams 4 and the lack of support. Specifically, according to the calculation requirements, the cushion beam 5 is installed as needed, that is, it is determined whether the cushion beam 5 needs to be erected according to the different lateral pressures during concrete pouring; if the cushion beam 5 needs to be erected, the cushion beam 5 is first connected and locked with the second-layer compression beam, and then the second-layer compression beam is connected and locked with the bottom-layer compression beam 4.

[0064] like Figure 8 As shown, in the embodiment of the present invention, the structure of the second layer compression beam is the same as that of the bottom layer compression beam 4, and is also an I-shaped structure. During installation, the second layer compression beam is arranged in a direction perpendicular to the bottom layer compression beam 4, but is not limited to being arranged in the vertical direction, and can also be arranged at an angle. The flange plate Ⅰ401 and the flange plate Ⅱ404 of the second layer compression beam are in contact with the flange plate Ⅰ401 and the flange plate Ⅱ404 of the bottom layer compression beam 4. At this time, the web 402 of the second layer compression beam is parallel to the prefabricated wall panel 1, and the connecting hole 403 thereon is connected with the tension bolt group 2 of the hollow wall. Preferably, the corresponding connecting holes 403 on the bottom layer compression beam 4 and the second layer compression beam are connected by a group of tension bolt groups 2 to facilitate installation and disassembly and improve work efficiency. On the other hand, because the connecting hole 403 on the web 402 is designed as an elliptical hole, the installation position of the second layer compression beam can be adjusted, eliminating the problem that the second layer compression beam cannot be installed due to the position error of the tension bolt group 2 when connecting with multiple bottom layer compression beams 4.

[0065] In this embodiment, Figure 7 As shown, the second layer of compression beams includes a second layer of long compression beams 6 and / or a second layer of short compression beams 9, wherein the second layer of long compression beams 6 is used to connect more than two bottom layer compression beams 4; the second layer of short compression beams 9 is used to connect two adjacent bottom layer compression beams 4. The structures of the second layer of long compression beams 6 and the second layer of short compression beams 9 are the same as those of the bottom layer compression beams 4, and the webs 402 are parallel to the prefabricated wall panels 1. The second layer of long compression beams 6 or the second layer of short compression beams 9 are selected according to the specific situation to install the cushion beams 5. The cushion beams 5 cooperate with the second layer of compression beams to form a compacting state for the prefabricated wall panels 1 to prevent the prefabricated wall panels 1 from expanding during casting.

[0066] In the embodiment of the present invention, the structure of the cushion beam 5 is the same as that of the bottom layer compression beam 4, and the cross section is also an I-shaped structure. The length of the cushion beam 5 is less than that of the second layer compression beam. The cushion beam 5 is vertically connected to the second layer compression beam, and the corresponding connecting holes 403 on the webs 402 of the two are connected by connecting bolts 7. Preferably, the connecting bolts 7 are also T-bolt structures, and the T-bolts are twisted so that their heads are perpendicular to the elliptical connecting holes 403, thereby performing axial limiting. When the second layer compression beam is connected to the bottom layer compression beam 4, the flange plates Ⅰ401 and Ⅱ404 of the cushion beam 5 are in vertical contact with the prefabricated wall panel 1, and the webs 402 are parallel to the prefabricated wall panel 1. At this time, the cushion beam 5 can effectively enhance the anti-expansion mold capacity of the local position of the hollow wall.

[0067] In this embodiment, the compression beam assembly uses a bottom compression beam 4, a second compression beam and a cushion beam 5 to form a frame structure. The frame structure is symmetrically arranged on the outside of the two prefabricated wall panels 1 in the hollow cavity. During the secondary pouring process on site, the anti-expansion mold capacity is enhanced, the safety hazard of wall force is eliminated, and the problem of ribs on the side of the wall panel is solved, so that the overall force is more sufficient and the project cost is reduced; at the same time, the overall accuracy of the hollow wall is improved, so that the overall building can better meet the aesthetic requirements.

[0068] Embodiment 3

[0069] like Fig.10 As shown, on the basis of the second embodiment, the compression beam assembly includes multiple bottom compression beams 4, at least one second-layer compression beam and a cushion beam 5 connected to the second-layer compression beam, and also includes a sealing plate 8. The sealing plate 8 is connected to the second-layer compression beam, and is connected to the bottom-layer compression beam 4 through the second-layer compression beam, so that the sealing plate 8 is fitted with the prefabricated wall panel 1, thereby sealing the holes and embedded parts on the prefabricated wall panel 1 through the sealing plate 8, thereby avoiding serious leakage of slurry in the holes during the secondary concrete pouring.

[0070] like Figure 11-12 As shown, in the embodiment of the present invention, the sealing plate 8 includes an end plate 802 and a sealing beam 801 disposed on the end plate 802, wherein the sealing beam 801 is connected to the second layer compression beam, and the end plate 802 is fitted with the prefabricated wall panel 1. Specifically, the structure of the sealing beam 801 is the same as that of the bottom layer compression beam 4, and the cross section is an I-shaped structure, and its upper web 402 is parallel to the end plate 802. Fig.13 As shown, when the sealing plate 8 is connected to the second layer pressure beam, the sealing beam 801 is vertically arranged with the second layer pressure beam and connected by connecting bolts 7, which are also T-bolt assemblies. Specifically, the total height of the sealing plate 8 is consistent with the height of the cushion beam 5 to ensure tight and flat compression.

[0071] In this embodiment, the bottom layer compression beam 4 is close to the outer surface of the prefabricated wall panel 1 and is generally designed as a long beam; the two ends of the second layer compression beam are fixed to the bottom layer compression beam 4, and the middle layer is pressed by the cushion beam 5 or the sealing plate 8 as needed. The second layer short compression beam 9 is used, which is convenient and flexible to install. The length and arrangement position of the cushion beam 5 are determined by calculation, and the sealing plate 8 prevents serious leakage of grout from the holes during the secondary concrete pouring.

[0072] A construction process of the precast concrete hollow wall anti-expansion formwork device as described in any of the above embodiments comprises the following steps:

[0073] 1) The bottom compression beam 4 is symmetrically installed on the outer sides of the two prefabricated wall panels 1 of the hollow wall, and the bottom compression beam 4 is connected with the tension bolt group 2 of the hollow wall; after installation, the flange plate I 401 and the flange plate II 404 of the bottom compression beam 4 are in vertical contact with the prefabricated wall panel 1, and the web plate 402 of the bottom compression beam 4 is parallel to the prefabricated wall panel 1; at this time, the original point connection has been changed into a line connection, which greatly enhances the anti-expansion mold capacity of the wall;

[0074] 2) Connecting the cushion beam 5 to the second layer compression beam through the connecting bolts 7; specifically, the cushion beam 5 is perpendicular to the second layer compression beam, and the cushion beam 5 and the web 402 in the second layer compression beam are connected to each other;

[0075] 3) Connect the second layer compression beam connected with the cushion beam 5 to the bottom layer compression beam 4, and the cushion beam 5 abuts against the prefabricated wall panel 1; specifically, the second layer compression beam is perpendicular to the bottom layer compression beam 4 and is fixed by the tension bolt group 2, and at this time, the web 402 of the second layer compression beam is parallel to the prefabricated wall panel 1;

[0076] Specifically, according to the calculation requirements, the cushion beam 5 is installed depending on the situation, that is, the different lateral pressures during concrete pouring determine whether the cushion beam 5 needs to be installed;

[0077] 4) Connect the sealing plate 8 to the second layer of compression beams; specifically, the sealing beam 801 of the sealing plate 8 is vertically connected to the second layer of compression beams;

[0078] 5) Connect the second layer compression beam connected with the sealing plate 8 to the bottom layer compression beam 4, so that the end plate 802 of the sealing plate 8 fits the position of the prefabricated wall panel 1 with the cavity and embedded parts;

[0079] 6) pouring concrete in the cast-in-place cavity 3 of the hollow wall;

[0080] 7) After curing and forming, the following parts are removed separately: the second layer compression beam, cushion beam 5, sealing plate 8, bottom layer compression beam 4 and tension bolt group 2, and the construction is completed.

[0081] In the embodiment of the present invention, the preparation process of the hollow wall is:

[0082] Preparation of prefabricated wall panels 1: parallel production, vertical assembly process, forming a hollow wall, such as Figure 1-2 As shown;

[0083] Hoisting, storage and transportation: Hollow wall products generally need to be stored and transported upright, which not only saves space but also makes transportation easier.

[0084] Lifting: The lifting point is at the limit sleeve, but the main force is on the limit bolt, and its shear strength (i.e. diameter) is designed and calculated. In actual operation, it can be lifted directly with a hook, or it can be lifted deep into the cavity with a shoulder pole.

[0085] The present invention reduces unnecessary auxiliary steel bars during the production and transportation of the hollow wall, and only requires ensuring the safety of production, transportation and hoisting, that is, the prefabricated hollow wall components shipped out of the factory can be transported to the construction site in accordance with national standards.

[0086] In the on-site pouring process, during the secondary pouring, the present invention strengthens the anti-expansion mold measures on the outer side of the prefabricated wall panel through the pressure beam assembly. As long as the anti-expansion mold measures of one layer are well done, they can be reused layer by layer. The anti-expansion mold measures are simplified, standardized, universal, and low in cost.

[0087] The above description is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A precast concrete hollow wall anti-expansion mold device, characterized in that: It comprises a hollow wall and a compression beam assembly, wherein the compression beam assembly comprises a plurality of bottom compression beams (4), the plurality of bottom compression beams (4) are arranged outside a prefabricated wall panel (1) of the hollow wall, and are connected to a tension bolt assembly (2) of the hollow wall, and a cast-in-place cavity (3) is provided between two prefabricated wall panels (1); The bottom compression beam (4) comprises a flange plate I (401), a web plate (402) and a flange plate II (404), wherein the flange plate I (401) and the flange plate II (404) are arranged in parallel, and the web plate (402) is vertically connected between the flange plate I (401) and the flange plate II (404); the web plate (402) is parallel to the prefabricated wall panel (1), and a plurality of connection holes (403) for connecting with the tension bolt group (2) are provided on the web plate (402) along the length direction; The compression beam assembly further comprises at least one second-layer compression beam and a cushion beam (5) connected to the second-layer compression beam, wherein the second-layer compression beam is arranged on the outside of the bottom-layer compression beam (4) and is connected to at least two of the bottom-layer compression beams (4); the cushion beam (5) is located on the inside of the second-layer compression beam and is in contact with the prefabricated wall panel (1), and the cushion beam (5) is connected to the second-layer compression beam via a connecting bolt (7); The two-layer compression beam comprises a two-layer long compression beam (6) and / or a two-layer short compression beam (9), wherein the two-layer long compression beam (6) is used to connect more than two of the bottom layer compression beams (4); and the two-layer short compression beam (9) is used to connect two adjacent bottom layer compression beams (4); The structures of the second-layer long compression beam (6) and the second-layer short compression beam (9) are the same as the structure of the bottom-layer compression beam (4), and the webs (402) are parallel to the prefabricated wall panels (1); The compression beam assembly further comprises a sealing plate (8), wherein the sealing plate (8) is connected to the second-layer compression beam and is used to seal holes and embedded parts on the prefabricated wall panel (1).

2. The precast concrete hollow wall anti-expansion mold device according to claim 1, characterized in that: The connecting hole (403) is an elliptical hole; The tension bolt assembly (2) comprises a T-shaped screw rod (201), a washer (202) and a fixing nut (203), wherein the T-shaped screw rod (201) is inserted into the elliptical hole and is locked by the washer (202) and the fixing nut (203).

3. The precast concrete hollow wall anti-expansion mold device according to claim 1, characterized in that: The sealing plate (8) comprises an end plate (802) and a sealing beam (801) arranged on the end plate (802), wherein the sealing beam (801) is connected to the second layer compression beam, and the end plate (802) is bonded to the prefabricated wall panel (1).

4. The precast concrete hollow wall anti-expansion mold device according to claim 3 is characterized in that: The structure of the sealing beam (801) is the same as that of the bottom layer compression beam (4); and the web plate (402) is parallel to the end plate (802).

5. A construction process for the precast concrete hollow wall anti-expansion formwork device according to any one of claims 1 to 4, characterized in that: The construction process includes the following steps: 1) symmetrically installing bottom compression beams (4) on the outer sides of two prefabricated wall panels (1) of the hollow wall, and connecting the bottom compression beams (4) to the tension bolt group (2) of the hollow wall; 2) Connecting the cushion beam (5) to the second-layer compression beam via connecting bolts (7); 3) connecting the second-layer compression beam connected to the cushion beam (5) to the bottom-layer compression beam (4), so that the cushion beam (5) abuts against the prefabricated wall panel (1); 4) Connecting the sealing plate (8) to the second layer compression beam; 5) connecting the second layer compression beam connected to the sealing plate (8) to the bottom layer compression beam (4) so ​​that the sealing plate (8) fits the hollow position of the prefabricated wall panel (1); 6) pouring concrete in the cast-in-place cavity (3) of the hollow wall; 7) After curing and forming, the following parts are removed: the second layer compression beam, the cushion beam (5), the sealing plate (8), the bottom layer compression beam (4) and the tension bolt assembly (2).

6. The construction process according to claim 5, characterized in that: In step 1), the flange plate I (401) and the flange plate II (404) of the bottom compression beam (4) are in vertical contact with the prefabricated wall panel (1), and the web plate (402) is parallel to the prefabricated wall panel (1); In step 2), the cushion beam (5) and the web plate (402) in the second layer compression beam are connected to each other; In step 3), the web plate (402) of the second layer compression beam is parallel to the prefabricated wall panel (1); In step 4), the sealing beam (801) of the sealing plate (8) is connected to the second layer compression beam; In step 5), the end plate (802) of the sealing plate (8) is fitted to the position of the prefabricated wall panel (1) having a hole.

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