Prefabricated wall mold for enlarging casting area, prefabricated wall and construction method

Abstract

The present invention provides a prefabricated wall mold for enlarging the pouring area, a prefabricated wall and a construction method thereof. The mold includes a quadrilateral template frame, an inner mold group is arranged in the quadrilateral template frame, and the inner mold group includes pipe fittings for constructing a concrete pouring channel, a first module for constructing an enlarged pouring area and a second module for constructing a bottom cast-in-place area; the inner mold group also includes a control mechanism for controlling the inner mold group to enter and exit the mold. The new type is beneficial for expanding the top concrete entry area during on-site pouring, facilitating the inflow of concrete, and enabling the concrete to be concentrated during vibration and flow into the pouring channel. The mold assembly is easy to disassemble, and can be produced in both flat molds and vertical molds.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated walls, in particular to a prefabricated wall mould with an enlarged casting area, a prefabricated wall and a construction method thereof. Background Art

[0002] Prefabricated walls are walls that are cast in advance using molds in the factory. When casting, pouring space is usually reserved for on-site casting.

[0003] At present, the prefabricated wall in the related technology is to reserve a concrete pouring channel from top to bottom in the wall, and the end of the channel is only a small round hole or square hole as a pouring hole. During the on-site construction process, it is necessary to tie the beam iron steel bars on site. The beam iron steel bars are very dense, which will form a certain degree of obstruction on the pouring hole, hindering the inflow and concentration of concrete.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a prefabricated wall mold with an enlarged pouring area and a prefabricated wall thereof, which is beneficial to expand the concrete entry area at the top during on-site pouring, facilitate the inflow of concrete, and enable the concrete to be concentrated and flow into the pouring channel when vibrated by a vibrating rod, and the mold assembly is easy to disassemble.

[0006] To achieve the above-mentioned purpose, in a first aspect, the present invention provides a prefabricated wall mold for an enlarged casting area, comprising a quadrilateral formwork frame, in which an inner mold group is arranged, and the inner mold group comprises a pipe for constructing a concrete pouring channel, a first module for constructing an enlarged casting area, and a second module for constructing a bottom cast-in-place area; the pipe runs through two opposite side formworks in the quadrilateral formwork frame, the first module is arranged on the inner side of one of the two opposite side formworks, and is sleeved on the pipe; the second module runs through the other side of the two opposite side formworks, and the pipe penetrates the second module and can rotate outside the quadrilateral formwork frame; the inner mold group also includes a control mechanism for controlling the inner mold group to enter and exit the mold.

[0007] Furthermore, the control mechanism includes a sliding groove opened along the axial direction of the tube on the circumferential surface of the tube located outside the quadrilateral template frame, a pin extending radially into the tube is provided in the sliding groove, and the part of the pin exposed from the sliding groove is connected to the second module.

[0008] Furthermore, a connecting plate is provided on the second module, and the pin vertically passes through the connecting plate to connect the second module to the pipe fitting.

[0009] Furthermore, the first module is a trapezoidal module, a semicircular module or an irregular module capable of expanding the casting area.

[0010] Furthermore, the second module is located at the outer side of the quadrilateral template frame and is also provided with a limiting structure for limiting the limit position of the inner mold assembly.

[0011] Furthermore, a plurality of inner mold groups are arranged in parallel in the quadrilateral template frame.

[0012] In a second aspect, the present invention provides a prefabricated wall made using the prefabricated wall mold with an enlarged casting area, comprising a prefabricated wall body, wherein a concrete pouring channel is constructed in the prefabricated wall body, one end of the concrete pouring channel is the enlarged casting area, and the cross-sectional area of ​​the enlarged casting area is larger than the cross-sectional area of ​​the end of the concrete pouring channel; the other end of the concrete pouring channel is the bottom cast-in-place area.

[0013] In a third aspect, the present invention also provides a construction method for the above-mentioned prefabricated wall, comprising the following steps:

[0014] Step 1: Hoisting prefabricated walls

[0015] Lift the prefabricated wall, lift it to the top of the floor and then drop it down, align and insert the exposed reinforcement groove of the upper wall with the longitudinal reinforcement extending from the top of the lower wall until the upper wall is stable;

[0016] Step 2: Wall adjustment

[0017] Height adjustment: a vertical adjustment screw is embedded on the top of the lower wall, and a nut is provided on the top of the adjustment screw; an iron sheet is embedded on the bottom surface of the upper wall at a position corresponding to the adjustment screw of the lower wall; after the iron sheet contacts the nut, it sits on it, and the elevation of the upper wall is adjusted up and down by adjusting the nut;

[0018] Verticality adjustment: Install an oblique support rod on the side of the wall. One end of the oblique support rod is hinged to the wall, and the other end is supported on the ground. The oblique support rod is a retractable adjustment rod. The verticality of the wall can be adjusted by adjusting the length of the oblique support rod.

[0019] Step 3: Hoisting prefabricated floor slabs

[0020] Lift the precast floor slab and install it on top of the wall;

[0021] Step 4: Laying the beam iron reinforcement

[0022] Lay the beam iron reinforcement on the top of the prefabricated floor slab; the beam iron reinforcement and the reinforcement extending from the top of the wall are arranged in an interlaced manner;

[0023] Step 5: Pour concrete into the expanded pouring area

[0024] Concrete is concentrated in the expanded pouring area and flows into the concrete pouring channel for on-site pouring;

[0025] After the on-site pouring is completed, the connection between the upper and lower walls is completed.

[0026] Compared with the prior art, the present invention has the following beneficial effects: by setting up an inner mold group with a special structure, while constructing a concrete pouring channel, an expanded pouring area with a larger area than the top of the concrete pouring channel is also constructed on the top of the wall. During on-site pouring, even if the beam iron and steel bars on the top of the wall are dense, the existence of the expanded pouring area does not affect the smooth inflow of concrete. Combined with the use of tools such as vibrators, the concrete can flow into the concrete pouring channel more quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the main structure of a prefabricated wall mold with an enlarged casting area provided in an embodiment of the present invention;

[0028] Figure 2 for Figure 1 Right view of;

[0029] Figure 3 for Figure 1 Left view of

[0030] Figure 4 A schematic diagram of a three-dimensional structure of a prefabricated wall mold with an enlarged casting area is provided for an embodiment of the present invention;

[0031] Figure 5 It is a partial enlarged structural schematic diagram of the control mechanism part;

[0032] Figure 6 A schematic diagram of the structure of a prefabricated wall provided in an embodiment of the present invention;

[0033] Figure 7 for Figure 6 Schematic diagram of the structure from another angle;

[0034] Figure 8 This is a schematic diagram of on-site construction of prefabricated walls;

[0035] Fig. 9 is a schematic diagram of the structure of a submodule of the first module in an embodiment;

[0036] Fig.10 for Fig. 9 A schematic diagram of the structure of the first module formed by splicing two submodules together;

[0037] Fig.11 is a schematic structural diagram of a submodule of the first module in another embodiment;

[0038] Fig.12 for Fig.11 A schematic diagram of the structure of the first module formed by splicing two submodules together;

[0039] Fig.13 is a schematic structural diagram of a submodule of the first module in another embodiment;

[0040] Fig.14 is a schematic structural diagram of a protrusion on the surface of the second module used to construct a keyway;

[0041] Fig.15 It is a structural schematic diagram of the keyway of the prefabricated wall;

[0042] Fig.16 is a schematic diagram of an oblique support in one embodiment;

[0043] Fig.17 It is a partial enlarged structural schematic diagram of the combined support structure;

[0044] Fig.18 is a schematic diagram of an oblique support in another embodiment;

[0045] Fig.19 for Fig.18 Schematic diagram after removing the floor slab;

[0046] Fig. 20 This is a schematic diagram of the embedded support structure on the top of the prefabricated wall;

[0047] Fig.21 It is a partial enlarged schematic diagram of the observation hole and the slurry retaining plate;

[0048] Fig. 22 Schematic diagram of the steel cage used for the second module;

[0049] Fig.23 It is a schematic diagram of the adjustment position of the edge of the prefabricated wall;

[0050] Fig.24 is a structural schematic diagram of another second module;

[0051] Fig.25 for Fig.24 A schematic diagram of the internal structure of the second module shown;

[0052] Fig.26 for Fig.24 a side view of the second module shown;

[0053] Fig. 27 for Fig.24 A schematic diagram of the structure of the coordination between the gear and the rack inside the second module;

[0054] Fig.28 It is a structural schematic diagram of mold tube plug-in;

[0055] Fig.29 It is a side view of the mold tube when it is plugged in;

[0056] Fig.30 It is a structural schematic diagram of the slurry retaining mechanism during corner wall construction;

[0057] Fig.31 This is a structural diagram of the slurry retaining mechanism during corner wall construction (including steel bars);

[0058] In the figure: 1-quadrilateral formwork frame; 2-inner mold group; 3-prefabricated wall; 4-iron steel bar; 101-upper side mold; 102-lower side mold; 103-left side mold; 104-right side mold; 21-first module; 210-sub-module; 211-notch; 22-second module; 23-pipe fitting; 231-sliding groove; 24-pin; 25-connecting plate; 26-trapezoidal combination plate; 31-expanded pouring area; 32-bottom cast-in-place area; 33-concrete pouring channel; 34-exposed steel bar groove; 35-key slot; 5-first oblique support rod; 6-second oblique support rod; 7-combined support mechanism; 71-channel steel; 72-pin shaft; 73-fixing bolt; 8-adjusting screw; 9-iron sheet; 10-reinforcement cage; 11-observation hole; 12-slurry retaining plate. DETAILED DESCRIPTION

[0059] The principle and spirit of the present invention will be described below with reference to several exemplary embodiments shown in the accompanying drawings. It should be understood that these embodiments are described only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way.

[0060] Please refer to Figure 1-5 The embodiment of the present invention provides a prefabricated wall mold with an enlarged casting area, including a quadrilateral template frame 1 and an inner mold group 2. The quadrilateral template frame 1 is surrounded by an upper mold 101, a lower mold 102, a left mold 103 and a right mold 104 to form a rectangular area with thickness. The quadrilateral template frame 1 is used to construct the outer edge shape of the wall.

[0061] The inner mold group 2 penetrates through two opposite side molds of the quadrilateral mold frame. For example, in this embodiment, one end of the inner mold group 2 penetrates through the upper side mold 101, and the other end penetrates through the lower side mold 102. The inner mold group portion located between the upper side mold 101 and the lower side mold 102 is used to construct the internal structure of the prefabricated wall, that is, when the concrete is poured, the inner mold group 2 hinders the flow of concrete, thereby forming a specific shape and structure inside the wall. Specifically, the inner mold group 2 includes a pipe 23 for constructing a concrete pouring channel, a first module 21 for constructing an expanded pouring area, and a second module 22 for constructing a bottom cast-in-place area. Among them, the pipe 23 penetrates through the upper side mold 101 and the lower side mold 102, and the first module 21 is arranged on the inner side of the upper side mold 101 and is sleeved on the pipe 23, and can slide along the axial direction of the pipe 23. The second module 22 penetrates through the lower side mold 102, and the second module 22 is also sleeved on the pipe 23, and can slide along the axial direction of the pipe 23. The inner mold assembly 2 also includes a control mechanism for controlling the mold entry and demolding of the inner mold assembly 2. The pipe 23 can rotate relative to the first module 21 and the second module 22, so as to be separated from the concrete when demolding.

[0062] The shape of the first module 21 can be various (such as Figure 9-13 ), as long as the pouring area of ​​the top of the wall can be expanded. In some embodiments, a trapezoidal module or a semicircular module can be used. Such a module forms a closing along the direction from the upper side mold 101 to the lower side mold 102, so that the concrete can flow into the concrete pouring channel along the closing. In some other embodiments, an irregularly shaped first module can also be used.

[0063] The first module can be an integral structure or can be composed of two sub-modules. Of course, only half of the sub-module can be used, that is, only the pouring area on one side of the concrete pouring channel is expanded. Fig. 9 , 11 The submodule 210 shown in 13 can be used alone and connected to the pipe by the notch 211 to only expand the casting area on one side of the pipe, or two identical or similar submodules can be spliced ​​together to form a Fig.10 , 12 The first module 21 of the overall structure is sleeved on the pipe.

[0064] In this embodiment, the control mechanism includes a sliding groove 231 provided on the peripheral surface of the pipe fitting 23 located outside the lower mold 102 and along the axial direction of the pipe fitting 23, and the sliding groove 231 is generally in the shape of a long strip. A pin 24 is provided in the sliding groove 231 and extends radially into the pipe fitting 23, and the portion of the pin 24 exposed from the sliding groove 231 is connected to the second module 22. Furthermore, a connecting plate 25 is provided on the second module 22, and the connecting plate 25 is also located outside the lower mold 102, is in the shape of a long strip, and extends in a direction away from the second module 22. After the top of the pin 24 vertically passes through the connecting plate 25, the second module 22 is connected to the pipe fitting 23. After the second module 22 and the pipe fitting 23 are connected together by the above-mentioned control mechanism, the pin 24 can slide back and forth along the sliding groove 231, and the two ends of the sliding groove 231 are the limit movement positions of the pin 24. When the pipe 23 is pushed, the first end of the sliding groove 231 away from the lower mold 102 gradually approaches the pin 24 until it presses against the pin 24, and the entire inner mold 2 is sent into the quadrilateral formwork frame 1 to complete the mold entry action. When the pouring is completed, the pipe 23 is pulled, and the pin 24 gradually approaches the end of the sliding groove 231 close to the lower mold until the sliding groove 231 pulls the pin 24, applying a pulling force to the entire inner mold 2, and the pipe 23 and the second module 22 are gradually pulled out of the prefabricated wall to complete the demolding action.

[0065] Pulling and pushing the pipe fitting 23 can be done manually, or hydraulic equipment, pneumatic equipment or electromechanical equipment can be used to complete. In some embodiments, a mechanical arm or manipulator can be used to control the pushing and pulling of the pipe fitting 23, thereby realizing intelligent production.

[0066] Furthermore, the second module 22 is located on the outer side of the quadrilateral formwork frame 1 and is also provided with a limiting structure for limiting the limit position of the inner module 2. In this embodiment, the limiting structure is a trapezoidal combination plate 26 connected to the connecting plate 25 on the second module 22, and the trapezoidal combination plate is also sleeved on the pipe 23. When the inner module 2 is molded, the trapezoidal combination plate 26 can finally abut against the outer side of the lower side mold 102, limiting the second module 22 from further entering, thereby achieving a limiting effect.

[0067] According to national standards, the interface between prefabricated components and post-cast concrete, grouting materials, and grouting materials should be provided with a rough surface, but the production of the rough surface is very complicated. Figure 14-15 As shown, the front and rear surfaces of the second module 22 also have protrusions 220, which are used to construct key grooves 35 on the inner surface of the cast-in-place area. The key grooves 35 are located at the joint surface between the cast-in-place concrete and the prefabricated wall. The key grooves on the joint surface can replace the rough surface required in the cast-in-place standard, saving the tedious process of making the rough surface.

[0068] The second module 22 can be made of a metal plate, or can be made of a steel cage 10 formed by closely stacking steel mesh sheets (such as Fig. 22 As shown), the steel cage 10 has the function of steel bars and does not need to be removed from the wall after pouring is completed, and can be integrated with the wall.

[0069] refer to Figure 24-27 In another embodiment, the second module includes a shell 14, baffles 143 are provided on both sides of the shell 14, and the baffles 143 are provided with through slots 147 for the transverse steel bars of the cast-in-place area to pass through. A vertically arranged rack 144 is connected to the inner side of each baffle 143, and a rotating shaft 142 is provided on the inner side of the rack 144, and a gear 145 that cooperates with the rack 144 is connected to the rotating shaft 142; a pipe 141 is also provided in the shell, and a pin hole 146 for installing a pin is provided on the upper surface of the pipe 141, and a limiting groove for limiting the movement of the pin is provided on the shell 14. When removing the mold, the pin is pulled out, the pipe is pulled out, and the rotating shaft 142 is rotated. With the cooperation of the rack and the gear, the baffle also rotates, thereby separating from the poured concrete part, so that the second module can be disassembled more labor-savingly.

[0070] In this embodiment, multiple groups of inner molds 2 can be arranged in parallel in the quadrilateral formwork frame 1. Accordingly, after the prefabricated wall is manufactured, multiple groups of enlarged casting areas and corresponding concrete pouring channels and bottom cast-in-place spaces can be formed.

[0071] like Figure 6-7 As shown, the present embodiment also provides a prefabricated wall 3 made using the prefabricated wall mold with the enlarged casting area. When using the mold, flat mold casting can be used, or vertical mold casting can be used after slight modification. Taking flat mold casting as an example, after the quadrilateral formwork frame 1 and the inner mold group 2 are assembled, the steel bars are embedded, and then concrete is poured into the mold. The concrete flows into the vacant space in the mold. After the concrete solidifies and cures, the quadrilateral formwork frame 1 and the inner mold group 2 are removed, and a prefabricated wall 3 having an enlarged casting area 31 on the top, a cast-in-place area 32 on the bottom, and a concrete pouring channel 33 in the middle is obtained. Among them, the cross-sectional area of ​​the enlarged casting area 31 is larger than the cross-sectional area of ​​the end of the concrete pouring channel 33. During on-site construction, the prefabricated wall 3 is erected, and the bottom is connected to the lower wall through an exposed steel bar groove 34 constructed in the cast-in-place area. The top is laid with beam iron steel bars 4 (such as Figure 8 As shown in the figure, although the beam iron reinforcement 4 forms a certain degree of shielding on the top of the prefabricated wall 3, since the expanded pouring area 31 is relatively large, when pouring concrete, even if the circular hole of the concrete pouring channel 33 is not very accurate, the concrete can first flow into the expanded pouring area 31 with a larger area. Combined with tools such as vibrators, it is more convenient for the concrete to be concentrated in the expanded pouring area 31 and flow into the concrete pouring channel to realize on-site pouring.

[0072] The embodiment of the present invention also provides a method for on-site construction using the above-mentioned prefabricated wall, the method comprising the following steps:

[0073] Step 1: Prefabricated wall hoisting

[0074] When lifting the prefabricated wall, during the lifting process, the lifting points must be firmly hung, the wall must not be tilted, and it must be lifted and lowered gently; after the wall is lifted to the top of the floor, it is slowly lowered, and the exposed reinforcement grooves of the upper wall and the longitudinal reinforcement extending from the top of the lower wall are aligned and inserted until the upper wall falls stably. For example, the bottom of the upper wall is embedded with iron sheets, and when the wall falls, it sits on the leveling bolts embedded above the lower wall.

[0075] Step 2: Wall adjustment

[0076] Height adjustment: As Fig. 20 As shown, a vertical adjusting screw 8 is embedded on the top of the lower wall, and a nut is provided on the top of the adjusting screw 8. An iron sheet 9 is embedded on the bottom surface of the upper wall at a position corresponding to the adjusting screw 8 of the lower wall. After the iron sheet contacts the nut, it sits on it, and the elevation of the upper wall can be adjusted up and down by adjusting the nut. By using this top support structure embedded in the wall, the elevation adjustment on site can be realized quickly, which improves the construction speed.

[0077] Verticality adjustment: An oblique support rod is installed on the side of the wall. One end of the oblique support rod is hinged to the wall, and the other end is supported on the ground. The oblique support rod is a retractable adjustment rod. The verticality of the wall can be adjusted by adjusting the length of the oblique support rod to meet the requirements.

[0078] The wall and the oblique support rod can be hinged in the following manner: a mounting hole is pre-arranged on the side of the wall, a hinge seat is installed in the mounting hole, and then one end of the oblique support rod is connected to the hinge seat, and the other end is also installed on the ground through the hinge seat. The hinge seat at the other end can also be replaced by a combined support mechanism 7, such as Figure 16-17 As shown, the combined support mechanism 7 includes a channel steel 71, which is fixed to the ground by fixing bolts 73. Two pins 72 are horizontally arranged in the channel steel 71, one of which is hinged to the first oblique support rod 5, and the other is hinged to the second oblique support rod 6. The inclination angles of the first oblique support rod 5 and the second oblique support rod 6 are different, and the inclination angle of the first oblique support rod 5 to the ground is greater than the inclination angle of the second oblique support rod 6 to the ground. Fig.18 The combined support mechanism and Figure 16-17 The same, the only difference is that it is used for interior wall structures, Fig.19 and Fig.18The difference is that the floor slab is removed, which makes it easier to observe the bolt position on the bottom of the combined support structure. Using the combined support mechanism, two inclined support rods with different inclination angles can be installed on the ground at the same time to achieve angle adjustment of different amplitudes and positions, saving the installation time of construction workers and the materials used for installation nodes. The combined support mechanism is firmly connected to the ground, safe and reliable.

[0079] Step 3: Hoisting prefabricated floor slabs

[0080] The prefabricated floor slab is hoisted and installed above the wall. This step can be achieved by using the existing prefabricated floor slab adjustment member installed on the wall.

[0081] Step 4: Laying the beam iron reinforcement

[0082] Lay the beam steel bars on top of the prefabricated floor slabs. The beam steel bars are interlaced with the steel bars extending from the top of the wall.

[0083] In the fourth step of laying the beam iron reinforcement, the pipe fitting 141 of the inner mold is divided into two sections, the lower section of the pipe fitting 141b is smaller in diameter than the upper section of the pipe fitting 141a, and a notch 141c is provided on the upper end of the pipe fitting for the beam iron transverse reinforcement to pass through. In this way, the length of the pipe fitting can be flexibly adjusted. If the required pipe fitting is too long, it can be spliced ​​and assembled by means of splicing. (For example, Figure 28-29 shown)

[0084] Step 5: Pour concrete into the expanded pouring area

[0085] Although the iron and steel bars of the beams block the top of the precast wall to a certain extent, since the expanded pouring area is relatively large, when pouring concrete, even if the alignment with the circular hole of the concrete pouring channel is not very accurate, the concrete can first flow into the larger expanded pouring area, and concentrate along the "funnel-shaped" inner wall of the expanded cast-in-place area. Combined with tools such as vibrators, it is more convenient for the concrete to be concentrated in the expanded pouring area and flow into the concrete pouring channel for on-site pouring.

[0086] Concrete flows into the cast-in-place area at the bottom along the concrete pouring channel, gradually filling it, and at the same time forming a grip with the steel bars at the bottom of the wall and the steel bars extending from the top of the lower wall. The inner surface of the cast-in-place area has a keyway, which replaces the rough surface and also saves the construction process of constructing the rough surface.

[0087] Combination Fig.21 As shown, before pouring concrete, an observation hole 11 is reserved on the surface of the prefabricated wall. The observation hole 11 is not blocked in the early stage and is blocked and smoothed after pouring. On the one hand, the observation hole 11 can play a venting role in the concrete pouring process to make the pouring denser. On the other hand, it can be used to observe whether the pouring is full.

[0088] During pouring, a baffle 12 may be provided between the prefabricated wall and the ground and fixed with steel bars to block the slurry.

[0089] After the on-site pouring is completed, the connection between the upper and lower walls is completed.

[0090] The prefabricated wall in the construction method can be an exterior wall or an interior wall. The wall can be a corner wall or a straight wall. The wall can have reserved openings such as doors and windows.

[0091] The length of the cast-in-place cavity at the edge of the precast wall is adjustable, e.g. Fig.23 As shown, there is also a cast-in-place cavity at the edge of the prefabricated wall. If the cavity is not full, it can be flexibly adjusted when designing the mold according to the actual needs of construction to make a suitable edge cavity length b1.

[0092] In particular, when constructing corner walls, an eccentric mortar retaining mechanism for the corner walls is used, such as Figure 30-31 As shown, the mechanism includes a shell 15, in which a rotating shaft 150 is provided. The rotating shaft 150 is connected to a first slurry barrier bar 151 through a first connecting rod 153, and is connected to a second slurry barrier bar 152 through a second connecting rod 154. A plurality of grooves for embedding horizontal steel bars are spaced apart on the first slurry barrier bar 151 and the second slurry barrier bar 152 to prevent the inflow of concrete.

[0093] The invention concept is described in detail using specific examples herein, and the description of the above embodiments is only used to help understand the core idea of ​​the invention. It should be pointed out that any obvious modification, equivalent substitution or other improvement made by a person of ordinary skill in the art without departing from the invention concept should be included in the protection scope of the present invention.

Claims

1. A prefabricated wall mold with an enlarged casting area, characterized in that: It comprises a quadrilateral formwork frame, in which an inner die set is arranged, the inner die set comprises a pipe for constructing a concrete pouring channel, a first module for constructing an enlarged pouring area and a second module for constructing a bottom cast-in-place area; the pipe runs through two opposite side formworks in the quadrilateral formwork frame, the first module is arranged on the inner side of one side formwork of the two opposite side formworks and sleeved on the pipe; the second module runs through the other side of the two opposite side formworks, and the pipe penetrates the second module and can rotate outside the quadrilateral formwork frame; the inner die set also comprises a control mechanism for controlling the inner die set to enter and exit the die; The control mechanism comprises a sliding groove provided on the peripheral surface of the pipe outside the quadrilateral template frame along the axial direction of the pipe, a pin extending radially into the pipe is provided in the sliding groove, and a portion of the pin exposed from the sliding groove is connected to the second module; The second module is located at the outer side of the quadrilateral template frame and is also provided with a limiting structure for limiting the limit position of the inner mold assembly.

2. The prefabricated wall mold with an enlarged casting area according to claim 1, characterized in that: The second module is provided with a connecting plate, and the pin vertically passes through the connecting plate to connect the second module with the pipe fitting.

3. The prefabricated wall mold with an enlarged casting area according to claim 1, characterized in that: The first module is a trapezoidal module, a semicircular module or an irregular module capable of expanding the casting area.

4. The prefabricated wall mold with an enlarged casting area according to claim 1, characterized in that: The inner mold groups are arranged in parallel in a plurality of groups in the quadrilateral template frame.

5. The prefabricated wall mold with an enlarged casting area according to claim 1, characterized in that: The surface of the second module has protrusions, and the protrusions are used to construct key grooves of the bottom cast-in-place area.

6. The prefabricated wall mold with an enlarged pouring area according to claim 1, characterized in that: The second module is a closed steel cage.

7. The prefabricated wall mold with an enlarged pouring area according to claim 1, characterized in that: The second module includes an outer shell, baffles are provided on both sides of the outer shell, the baffles are provided with through grooves for the transverse steel bars in the cast-in-place area to pass through, a vertically arranged rack is connected to the inner side of each baffle, a rotating shaft is provided on the inner side of the rack, and a gear matching the rack is connected to the rotating shaft; a pipe fitting is also provided in the outer shell, a pin hole for installing a pin is provided on the upper surface of the pipe fitting, and a limit groove for limiting the movement of the pin is provided on the outer shell.

8. A prefabricated wall made using the prefabricated wall mold with an enlarged casting area as claimed in claim 1, characterized in that: It comprises a prefabricated wall body, wherein a plurality of concrete pouring channels are constructed in the prefabricated wall body, one end of the concrete pouring channel is an enlarged pouring area, the cross-sectional area of ​​the enlarged pouring area is larger than the cross-sectional area of ​​the end of the concrete pouring channel; the other end of the concrete pouring channel is a bottom cast-in-place area.

9. A construction method of the prefabricated wall according to claim 8, characterized in that: The steps include: Step 1: Hoisting prefabricated walls Lift the prefabricated wall, lift it to the top of the floor and then drop it down, align and insert the exposed reinforcement groove of the upper wall with the longitudinal reinforcement extending from the top of the lower wall until the upper wall is stable; Step 2: Wall adjustment Height adjustment: a vertical adjustment screw is embedded on the top of the lower wall, and a nut is provided on the top of the adjustment screw; an iron sheet is embedded on the bottom surface of the upper wall at a position corresponding to the adjustment screw of the lower wall; after the iron sheet contacts the nut, it sits on it, and the elevation of the upper wall is adjusted up and down by adjusting the nut; Verticality adjustment: Install an oblique support rod on the side of the wall. One end of the oblique support rod is hinged to the wall, and the other end is supported on the ground. The oblique support rod is a retractable adjustment rod. The verticality of the wall can be adjusted by adjusting the length of the oblique support rod. Step 3: Hoisting prefabricated floor slabs Lift the prefabricated floor slab and install it on top of the wall; Step 4: Laying the beam iron reinforcement Lay the beam iron reinforcement on the top of the prefabricated floor slab; the beam iron reinforcement and the reinforcement extending from the top of the wall are arranged in an interlaced manner; Step 5: Pour concrete into the expanded pouring area Concrete is concentrated in the expanded pouring area and flows into the concrete pouring channel for on-site pouring; After the on-site pouring is completed, the connection between the upper and lower walls is completed.

10. The construction method according to claim 9, characterized in that: The oblique support rod is connected to the ground through a combined support mechanism, which includes a channel steel, which is fixed to the ground by bolts. Two pins are horizontally arranged in the channel steel, one of which is hinged to the first oblique support rod, and the other is hinged to the second oblique support rod. The inclination angles of the first oblique support rod and the second oblique support rod are different.

11. The construction method according to claim 9, characterized in that: The length of the cast-in-place cavity at the edge of the prefabricated wall is adjustable.

12. The construction method according to claim 9, characterized in that: An observation hole is reserved on the surface of the wall, which is not blocked before pouring is completed. On the one hand, it is used for exhaust, and on the other hand, it is used to observe whether the pouring is full and dense; after pouring is completed, the observation hole is blocked and smoothed.

13. The construction method according to claim 9, characterized in that: There is also a slurry retaining plate between the lower edge of the prefabricated wall and the construction ground for retaining slurry, and the slurry retaining plate is fixed by inserting steel bars.

14. The construction method according to claim 9, characterized in that: When constructing a corner wall, an eccentric corner wall slurry retaining mechanism is used. The mechanism includes an outer shell with a rotating shaft inside the outer shell. The rotating shaft is connected to a first slurry retaining bar through a first connecting rod and to a second slurry retaining bar through a second connecting rod. A plurality of grooves for embedding horizontal steel bars are constructed at intervals on the first slurry retaining bar and the second slurry retaining bar to prevent the inflow of concrete.

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