TWI840290B - Improved foundation and wall structure of prefabricated building - Google Patents

Abstract

A Improved foundation and wall structure of a prefabricated building is disclosed. It includes: a large bottom frame, which is formed by several C-shaped steels closed and surrounded; a plurality of column modules connected with one of these C-shaped steels, wherein each column module includes 4 foundation bolts and a hollow square tube column; and several external wall panels. Each external wall panel is screwed to different hollow square tube columns at both ends of the longer side, and is socketed with other external wall panels above and/or below to prevent the external water from seeping into the composite house. There is a connecting plate under the hollow square tube column. The connecting plate corresponds to a threaded section of the 4 foundation bolts and has 4 openings. After each hole is passed by a foundation bolt, the connecting plate and the foundation bolt are locked with a nut, respectively.

Description

Improved modular house foundation and wall structure

The present invention relates to an improved modular house, in particular to an improved modular house foundation and wall structure.

A modular house is a building or house structure that is composed of multiple modules. These modules are usually pre-fabricated in the factory and then transported to the construction site for assembly. The main advantages of modular houses include saving time and cost, because modular manufacturing can be completed quickly, reducing construction time and manpower resources. In addition, modular houses usually have high building quality and design flexibility, and can be customized according to different needs. Generally speaking, modular houses are mostly used in temporary (hypothetical) projects and are dismantled after the main project is completed. Modular houses are also used for disaster relief, such as rescue modular houses for earthquake victims. What's more, some temporary commercial activity buildings in recent years, such as stalls, holiday cabins, farmhouses, etc., will also use modular houses instead of fixed houses to save development time and cost.

The existing modular house structure has the following problems. Please see Figure 1, which is a partial cross-sectional view of the foundation and wall structure of a modular house. The foundation of the modular house is a concrete base 1, which is formed by positioning C-shaped steels 2 on four sides to restrict the flow of concrete. One inner side of the angle steel 3 is covered with the C-shaped steel 2, and the other side is fixed to the surface of the concrete base 1. The steel plate of the angle steel 3 covering the C-shaped steel 2 is locked with the C-shaped steel 2 through a foundation screw 4 to fix the angle steel 3 to the C-shaped steel 2. The steel plate of the angle steel 3 fixed to the surface of the concrete base 1 is welded to the column 5, and the wall plate is inserted between the columns 5 to form the modular roof wall. Since the angle steel 3 and the C-shaped steel 2 are locked at the side, if the shear resistance of the foundation screw 4 is not strong, it is easy to be broken by the misalignment of the C-shaped steel 2 and the angle steel 3, thereby reducing the supporting force of the column 5. In addition, since there is a gap between the column 5 and the wall plate, it is not easy to completely bond, so the moisture outside the modular house can easily penetrate into the house. At the same time, in order to strengthen the wind resistance of the column 5, the column 5 is generally fixed with a tension rod, which increases the complexity of the construction. Overall, the exposure of the tension rod and the column 5 reduces the appearance of the modular house.

In order to solve the above-mentioned problems of modular house structure, the improved modular house foundation and wall structure of the present invention is proposed.

This paragraph extracts and compiles certain features of the invention. Other features will be revealed in subsequent paragraphs. Its purpose is to cover various modifications and similar arrangements within the spirit and scope of the attached patent application.

In order to solve the above problems, the present invention proposes an improved modular roof foundation and wall structure. The improved modular roof foundation and wall structure includes: a large bottom frame, formed by a plurality of C-shaped steel rings, a floor steel bar mesh is laid between the inside of the C-shaped steel rings and the surface of the bearing soil and poured with concrete; a plurality of first column modules, connected to one of the C-shaped steels, each first column module includes: 4 foundation bolts, the bent section of each foundation bolt is placed on the surface of the bearing soil, the threaded section is vertically upward, and two adjacent foundation bolts are fixed by welding with steel bars, and two foundation bolts are connected to each other. Through one of the C-shaped steels; and a hollow square tube column, connected to the center of one side of a connecting plate at the bottom, the connecting plate is provided with 4 openings corresponding to the threaded sections of the 4 foundation bolts, each opening passes through a foundation bolt, and then the connecting plate and the foundation bolt are locked with a nut; and a plurality of external wall panels, each of which is screwed to different hollow square tube columns at both ends of the longer side, and is sleeved with other external wall panels above and/or below to prevent moisture from the outside of the modular house from penetrating into the inside.

The improved modular roof foundation and wall structure further includes a plurality of second column modules connected to one of the C-shaped steels and installed at the corner of the large bottom frame. Each second column module includes: 4 foundation bolts, the bent section of each foundation bolt is placed on the surface of the bearing soil, the threaded section is vertically facing upward, and two adjacent foundation bolts are welded and fixed with steel bars, and two of the foundation bolts pass through one of the C-shaped steels; and a hollow square tube column, which is connected to a corner of a connecting plate at the bottom. The connecting plate is provided with 3 openings corresponding to the threaded sections of 3 of the foundation bolts. After each opening passes through a foundation bolt, a nut is used to lock the connecting plate and the foundation bolt.

According to the present invention, each C-shaped steel is welded to a plurality of steel bars fixedly inserted in the bearing soil to maintain the shape and horizontal plane of the large bottom frame.

According to the present invention, each C-shaped steel is connected to each other with the longer side of the cross section perpendicular to the horizontal plane, and a pair of circular holes are opened at opposite positions of the steel plates on both sides of the shorter side of the cross section to allow a foundation bolt to pass through.

The improved modular house foundation and wall structure may further include a plurality of color steel plates, each of which is fixed to the adjacent part of two rows of exterior wall plates or the outer side of the edge of a single row of exterior wall plates with waterproof glue along the screw position of the exterior wall plates. The color steel plate may have a wavy structure, and the waterproof glue is silicone glue.

According to the present invention, the upper edges of the C-shaped steels are located at the same elevation, and the concrete surface is flush with the upper edges of the C-shaped steels to form a modular roof floor. The bottom of the connecting plate and the concrete surface are tightly connected by nuts and foundation bolts.

According to the present invention, the C-shaped steels further include a plurality of triangular diagonal braces, each of which is formed by obliquely welding two steel bars and inserted into the supporting soil, and each C-shaped steel is welded to the upper ends of at least two triangular diagonal braces, thereby increasing the distance between the elevation of the upper edges of the C-shaped steels and the elevation of the surface of the supporting soil.

According to the present invention, the outer wall plate comprises: a surface steel plate, an anti-expansion groove is formed in the center along the longer side of the outer wall plate, one side is indented inwardly to form a long joint section, and the other side is folded back to form a long covering section, wherein a locking groove is formed in the long joint section for screws to pass through and the head of the screw does not exceed the long joint section; an inner steel plate, one side is indented inwardly to form a short joint section along the longer side of the outer wall plate, and the other side is folded back to form a short covering section; and a heat insulation layer is formed between the surface steel plate and the inner steel plate, and the material thereof is flame-resistant second-grade styrofoam. When the upper and lower exterior wall panels are connected with the longer side, the long covering section covers a part of the long joint section, and the short covering section covers the entire short joint section, and the covered long joint section includes the locking groove.

Because the foundation bolts pass through the C-shaped steel, the column module and the large bottom frame are tightly connected. The hollow square tube column of the present invention has better supporting force than the existing modular house columns, and there is no need to use tension rods to enhance safety, which can reduce the waste of man-hours and materials. Locking the exterior wall panels and hollow square tube columns and using color steel plates to seal the edges can prevent water seepage in the modular house while not exposing the screws and hollow square tube columns, making the modular house more beautiful. From this point of view, the shortcomings of the aforementioned modular house can be solved in the present invention.

1: Concrete outsole

2: C-type steel

3: Angle steel

4: Base screw

5: Pillar

10: Large bottom frame

11: C-type steel

13: Floor steel mesh

14: Concrete

15: Triangular diagonal brace

20: First column module

20’: Second column module

21: Foundation bolts

211: Bend section

212: Threaded section

22: Hollow square tube column

23: Steel bars

24: Connecting plate

241: Opening

242: Nut

30:Exterior wall panels

31: Surface steel plate

311: Anti-expansion groove

312: Long joint section

313: Long coating section

314: Locking groove

32: Inner steel plate

321: Short joint section

322: Short coating section

33: Insulation layer

40: Color steel plate

N: Screw

S: Loading soil

Figure 1 is a partial cross-sectional view of a combined foundation and wall structure of known technology.

Figure 2 is a side view of an improved modular house foundation and wall structure according to an embodiment of the present invention.

Figure 3 is a top view of the foundation and wall structure of the improved modular house.

Figure 4 shows a setting status of a column module and a large bottom frame.

Figure 5 is a cross-sectional view of an exterior wall panel.

Figure 6 shows the appearance of the external wall panels being connected.

Figure 7 shows the color steel plate and two rows of exterior wall panels bonded together.

The present invention will be described in more detail with reference to the following embodiments.

Please see Figures 2 and 3. Figure 2 is a side view of an improved modular house foundation and wall structure according to the embodiment of the present invention, and Figure 3 is a top view of the improved modular house foundation and wall structure. The improved modular house foundation and wall structure is mainly composed of: a large bottom frame 10, a plurality of first column modules 20, a plurality of second column modules 20', a plurality of exterior wall panels 30 and a plurality of color steel panels 40. The following introduces the types, functions and mutual combination methods of the above-mentioned technical components respectively.

The large base frame 10 is assembled on a horizontal plane and is a part of the foundation structure of the modular house built using the improved modular house foundation and wall structure. Since modular houses are different from permanent buildings, they have a short life span and require the characteristics of quick construction and quick dismantling, and generally do not consider special (such as hurricane resistance) or large loads (such as multi-story structures). Therefore, the foundation of the modular house using the present invention does not use raft foundations or ground beams, but is replaced by concrete plus floor steel mesh. The large base frame 10 is formed by a plurality of C-shaped steels 11 that are closed and surrounded. C-shaped steel is a commonly used steel structure material, which has the advantages of light weight (compared to I-shaped beams), high strength, easy cutting, and easy welding. The modular house in this embodiment is relatively small, as shown in FIG3 , and uses four C-shaped steels 11 to enclose and surround a rectangular large bottom frame 10, wherein the length of two C-shaped steels 11 is longer than the length of the other two C-shaped steels 11. Two first column modules 20 and two second column modules 20' are combined on the longer C-shaped steel 11, and two second column modules 20' are combined on the shorter C-shaped steel 11. The second column module 20' is used to build the columns at the corners of the large bottom frame 10 and is installed at the corners of the large bottom frame 10, while the first column module 20 is used for the columns at other non-corners of the large bottom frame 10. According to the present invention, the number of C-shaped steels 11, the first column modules 20 and the second column modules 20' is not limited thereto, and can be changed according to the design of the modular house. Since the C-shaped steel 11 has a strong anti-bending ability, for a modular house with a smaller foundation, four C-shaped steels 11 are welded in pairs on a flat ground and placed at the preset construction site. The large bottom frame 10 can be placed by correcting it with a level ruler (pressing down the raised part). However, for a modular house with a larger foundation, the large bottom frame uses a large number of C-shaped steels, and the shape formed is not a simple rectangle, so relative deformation (bending) is inevitable. In addition, since the upper edge or lower edge of the C-shaped steel 11 needs to be at the same elevation, according to the present invention, each C-shaped steel 11 can be welded with a number of triangular diagonal braces 15 fixedly inserted in the bearing soil to maintain the appearance and horizontal plane of the large bottom frame 10.

As shown in FIG3 , a floor steel bar mesh 13 is laid between the inner part of the C-shaped steel bars 11 and the surface of the bearing soil, and concrete 14 is poured. In FIG3 , the concrete 14 is represented by a black dotted background. The floor steel bar mesh 13 is covered by the concrete 14 and cannot be directly viewed from above, so the arrangement position of the floor steel bar is indicated by a thick dotted line. Similar to the general foundation engineering, the ground leveling should be carried out at the location of the modular house foundation to keep the surface of the bearing soil at the same level as much as possible. However, this is impossible in practice, but at least any part of the laid floor steel bar mesh 13 should not be higher than the upper edge of the C-shaped steel bar 11, so that part of the floor steel bar mesh 13 protrudes from the surface of the concrete 14. The surface of the bearing soil will not allow the height difference between the various parts of the laid floor steel reinforcement mesh 13 to be too large, reducing the foundation's anti-bending ability. It should be noted that although the opening of the C-shaped steel 11 faces inward in the embodiment of Figure 2 (the C-shaped steel 11 facing the reader is removed in Figure 2 so that the internal structure blocked by the C-shaped steel 11 can be seen), the present invention does not limit the placement of the C-shaped steel 11. The openings of the C-shaped steel 11 can all face outward, or partly face outward and partly face inward. Since the openings at both ends of the C-shaped steel 11 are not closed, temporary templates can be used to close them during the grouting operation to avoid overflow.

The first column module 20 is a technical element used to connect the non-corner part of the foundation (large base frame 10) in the improved modular roof foundation and wall structure to bear the weight of the upper structure. The first column module 20 is not set up alone, but is connected to one of the C-shaped steels 11, and the connection method will be described in detail below. Each first column module 20 includes at least 4 foundation bolts 21 and a hollow square tube column 22. According to the present invention, the foundation bolt 21 can be a commercially standardized foundation bolt used for connecting the steel structure foundation; it can also be a customized product made of a threaded rod welded after bending the steel bar according to the thickness requirement of the modular roof foundation. For the detailed appearance of the first column module 20, please refer to FIG. 2 and FIG. 4 at the same time. FIG. 4 shows the arrangement of the second column module 20' and the large base frame 10 in this embodiment. The arrangement of the foundation bolts 21 of the second column module 20' is the same as the first column module 20. Structurally, each foundation bolt 21 has a bent section 211 and a threaded section 212. The bent section 211 is a shorter extension of the foundation bolt 21 after it is bent during manufacturing, which is used to strengthen the bond with the concrete in the large base structure, provide shear resistance to the foundation bolt 21 and prevent the foundation bolt 21 from being pulled out of the concrete. The end of the longer extension of the threaded section 212 after being bent can be screwed onto a nut. According to the present invention, the bent section 211 of the foundation bolt 21 should be placed on the surface of the supporting soil S. In this embodiment, since there is a distance between the large base frame 10 and the surface of the supporting soil S, the C-shaped steels 11 include a plurality of triangular diagonal braces 15 (considering the support balance, at least two triangular diagonal braces 15 should be welded to each C-shaped steel 11). Each triangular diagonal brace 15 is formed by obliquely welding two steel bars and inserted into the supporting soil S. In appearance, the triangular diagonal brace 15 is similar to an inverted V-shaped structure, inserted into the supporting soil S, and one of the steel bars is preferably perpendicular to the horizontal plane to effectively control the elevation of the C-shaped steel 11 after welding. As mentioned above, each C-shaped steel 11 is welded to the upper ends of at least two triangular diagonal braces 15, thereby controlling the distance between the elevation of the upper edge of the C-shaped steel 11 and the elevation of the surface of the supporting soil S. Before pouring concrete, there is an obvious gap between the lower edge of the C-shaped steel 11 and the supporting soil S. In order to prevent the uncured concrete from flowing out of the gap and causing waste, a template can be set up on the outside of the C-shaped steel 11 and removed after the grouting is completed.

During installation, the threaded section 212 is vertically upward. In order to fix the foundation bolts 21 before grouting, two adjacent foundation bolts 21 can be welded and fixed with steel bars 23. Since there are four foundation bolts 21, four steel bars 23 can be welded and fixed around the foundation bolts 21. The "steel bar welding ring" formed can be more than one, but can be two as shown in Figures 2 and 4 to ensure the overall rigidity. If the first column module 20 cannot be effectively connected to the foundation, especially the C-shaped steel 11 of the large bottom frame 10, the upper structure supported by the column will be easily shaken or even collapsed due to external forces (such as earthquakes). Therefore, the first column module 20 must be effectively connected to the C-shaped steel 11 so that the load of the upper structure can be transmitted to the C-shaped steel 11 and the foundation bearing soil. See Figure 4. The present invention passes two of the four foundation bolts 21 through one of the C-shaped steels 11. When the space surrounding the C-shaped steel 11 is closed with concrete, the concrete will also wrap the C-shaped steel 11 and the penetrated foundation bolts 21 together. Similar to the structural design of reinforced concrete, the C-shaped steel 11, which plays the role of a ground beam, can be integrated with the foundation bolts 21 to bear the upper load from the hollow square tube column 22. The placement of the C-shaped steel 11 is further explained as follows. Each C-shaped steel 11 is connected to each other with the longer side of the cross section perpendicular to the horizontal plane, that is, the end section of the installed C-shaped steel 11 is close to a C-shape when viewed by human eyes, and does not tilt to any side. A pair of circular holes (not shown) are opened at opposite positions of the steel plates on both sides of the shorter side of the cross section of the C-shaped steel 11, and each circular hole can allow a foundation bolt 21 to pass through.

The hollow square tube column 22 is a technical element that bears the weight of the assembled roof upper structure and is used to install the exterior wall panel 30. As shown in the first column module 20 on the left side of Figure 3, the bottom of the hollow square tube column 22 of the first column module 20 is connected to the center of one side of a connecting plate 24. The connecting plate 24 has four openings 241 corresponding to the threaded sections 212 of the four foundation bolts 21. After each opening 241 passes through a foundation bolt 21, a nut 242 is used to lock the connecting plate 24 and the foundation bolt 21. Before assembling the hollow square tube column 22, the concrete pouring operation has been completed and the concrete has reached the designed strength. Since the upper edges of the C-shaped steels 11 are at the same elevation, the concrete surface is flush with the upper edges of the C-shaped steels 11 to form a modular roof floor. The bottom of the connecting plate 24 and the concrete surface are tightly connected by the nuts 242 and the foundation bolts 21. The weight of the upper structure of the modular roof from the hollow square tube columns 22 can be effectively transferred to the C-shaped steels 11, and the hollow square tube columns 22 are not easily shaken by external forces.

As mentioned above, the second column module 20' is located at a different position from the first column module 20, and its shape is slightly different. Please refer to Figures 2 and 3 at the same time. The second column module 20' is connected to one of the C-shaped steels 11 and installed at the corner of the large base frame 10. Each second column module 20' also includes 4 foundation bolts 21 and 1 hollow square tube column 22. Like the first column module 20, the bent section 211 of each foundation bolt 21 is placed on the surface of the bearing soil, and the threaded section 212 is also vertically upward. Two adjacent foundation bolts 21 are welded and fixed with steel bars 23, and two of the foundation bolts 21 pass through one of the C-shaped steels 11. The difference between the two lies in the shape of the hollow square tube column 22. As shown in the second column module 20' on the left side of Figure 3, the bottom of the hollow square tube column 22 is connected to a corner of the connecting plate 24. The connecting plate 24 has three openings 241 corresponding to the threaded sections 212 of the three foundation bolts 21. After each opening 241 passes through a foundation bolt 21, a nut 242 is used to lock the connecting plate and the foundation bolt 21. It should be noted that a set of threaded sections 212 and nuts 242 of the foundation bolt 21 are inserted into the hollow square tube column 22, which is shown in dotted lines in Figure 2, so the number of openings 241 of the connecting plate 24 is only 3.

The exterior wall panel 30 is another technical feature of the present invention. Since the existing modular house uses C-shaped steel as the column, based on the consideration of immediate material saving in construction, the exterior wall is made by inserting the wall panel into the slot between two adjacent C-shaped steel columns. Although waterproof glue is used for bonding, the gap between the C-shaped steel column and the wall panel is too large, and the sealing work of the waterproof glue is usually not ideal. Water outside the modular house, such as rainwater, can easily penetrate into the house. In addition, the C-shaped steel column of this structure leaks out, which reduces the appearance of the modular house. To solve this problem, as shown in FIG. 2 , each exterior wall panel 30 in the present invention is respectively fixed to different hollow square tube columns 22 with screws N at both ends of the longer side, and is connected with other exterior wall panels 30 above and/or below to prevent moisture from the outside of the modular house from penetrating into the inside.

According to the present invention, the structure of the exterior wall panel 30 is different from that of the conventional wall panel. Please refer to FIG5 , which is a cross-sectional view of an exterior wall panel 30. The exterior wall panel 30 includes a surface steel plate 31, an inner steel plate 32 and a heat insulation layer 33. When installed, the surface steel plate 31 faces the outside of the modular house. The surface steel plate 31 forms an anti-expansion groove 311 in the center along the longer side of the exterior wall panel 30. When the outside temperature rises, the anti-expansion groove 311 can serve as a buffer for the expansion of the steel plates on both sides, so that the surface steel plate 31 will not be deformed or bent. The surface steel plate 31 is also concave inwardly on one side along the longer side of the outer wall plate 30 to form a long joint section 312, and is folded back on the other side to form a long covering section 313. A locking groove 314 is formed in the long joint section 312, and the locking groove 314 can be used to allow a screw to pass through without the head of the screw exceeding the long joint section 312. For a further understanding of this, please refer to Figure 6, which shows the state of the outer wall plates 30 when they are sleeved. The lower outer wall plate 30 is locked to the hollow square tube column 22 using a screw N in the locking groove 314. Because the locking groove 314 is recessed downward, the head of the screw N is "buried" in the locking groove 314 after locking, so that when the two outer wall panels 30 are connected, they will not be stuck to each other due to the protruding head of the screw N. The inner steel plate 32 is recessed inward on one side along the longer side of the outer wall panel 30 to form a short joint section 321, and is folded back on the other side to form a short covering section 322. The length of the short joint section 321 is similar to that of the short covering section 322. The heat insulation layer 33 is formed between the surface steel plate 31 and the inner steel plate 32, and its material can be flame-resistant second-grade styrofoam.

In FIG. 6 , when the upper and lower exterior wall panels 30 are connected to each other with the longer sides, the long covering section 313 only covers a part of the long joint section 312, while the short covering section 322 almost covers the entire short joint section 321. It should be noted that the covered long joint section 312 includes a locking groove 314. In this way, the head of the screw N is covered by the long covering section 313 and is not exposed to the outside. In order to prevent water rust, the surface steel plate 31 and the inner steel plate 32 can use polyester paint (Polyester, PE) painted colored steel plates.

Although the screws N in the locking groove 314 are covered, as shown in FIG2 , the screws N in the anti-expansion groove 311 are still exposed, making the modular house look ugly. Therefore, the color steel plate 40 is used to remedy this shortcoming and prevent the moisture outside the modular house from penetrating into the interior between the outer wall plate 30 and the hollow square tube column 22. Each color steel plate 40 is glued to the adjacent part of two rows of outer wall plates 30 or the outer side of the edge of a single row of outer wall plates 30 along the screw N position of the outer wall plate 30 with waterproof glue. FIG2 is an example of using a single row of outer wall plates 30. The color steel plate 40 on the left side has been glued to the left side of the three exterior wall panels 30, so the screws N and the hollow square tube columns 22 cannot be seen from the color steel plate 40. Preferably, the color steel plate 40 has a wave structure, such as a corrugated board. In practice, the aforementioned waterproof glue can be silicone glue. See Figure 7, which shows the state of the color steel plate 40 and the two rows of exterior wall panels 30 when they are glued. The color steel plate 40 blocks the screws N of the two rows of exterior wall panels 30 from being exposed at one time, and also prevents moisture from penetrating into the interior of the modular house from the edge of the exterior wall panel 30 and the hollow square tube column 22.

Although the present invention has been disclosed in the form of implementation as above, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of the patent application attached hereto.

11: C-type steel

14: Concrete

15: Triangular diagonal brace

20’: Second column module

20: First column module

21: Foundation bolts

211: Bend section

212: Threaded section

22: Hollow square tube column

23: Steel bars

242: Nut

30:Exterior wall panels

311: Anti-expansion groove

40: Color steel plate

N: Screw

Claims (9)

An improved modular house foundation and wall structure comprises: a large bottom frame formed by a plurality of C-shaped steel rings, a floor steel bar mesh is laid between the inside of the C-shaped steel rings and the surface of the bearing soil and concrete is poured; a plurality of first column modules are connected to one of the C-shaped steels, each of the first column modules comprises: 4 foundation bolts, the bent section of each foundation bolt is placed on the surface of the bearing soil, the threaded section is vertically upward, two adjacent foundation bolts are fixed by welding with steel bars, and two of the foundation bolts pass through one of the C-shaped steels; and a hollow square tube column, the lower part of which is connected to the ground by a steel bar. Connected to the center of one side of a connecting plate, the connecting plate is provided with four openings corresponding to the threaded sections of the four foundation bolts. After each opening passes through a foundation bolt, a nut is used to lock the connecting plate and the foundation bolt respectively; and a plurality of external wall panels, each of which is screwed to different hollow square tube columns at both ends of the longer side, and is sleeved with other external wall panels above and/or below to prevent moisture from the outside of the modular house from penetrating into the inside, wherein each C-shaped steel is welded to a plurality of steel bars fixedly inserted in the bearing soil to maintain the appearance and horizontal plane of the large bottom frame. The improved modular house foundation and wall structure as described in claim 1 further comprises a plurality of second column modules connected to one of the C-shaped steels and installed at the corner of the large bottom frame, each second column module comprising: 4 foundation bolts, the bent section of each foundation bolt is placed on the surface of the bearing soil, the threaded section is vertically upward, two adjacent foundation bolts are welded and fixed with steel bars, and two of the foundation bolts pass through one of the C-shaped steels; and a hollow square tube column, connected at the bottom to a corner of a connecting plate, the connecting plate is provided with 3 openings corresponding to the threaded sections of 3 of the foundation bolts, and after each opening passes through a foundation bolt, the connecting plate and the foundation bolt are locked with a nut respectively. The improved modular house foundation and wall structure as described in claim 1 or 2, wherein each C-shaped steel is connected to each other with the longer side of the cross section perpendicular to the horizontal plane, and a pair of circular holes are opened at opposite positions of the steel plates on both sides of the shorter side of the cross section to allow a foundation bolt to pass through. The improved modular house foundation and wall structure as described in claim 1 further comprises a plurality of color steel plates, each of which is fixed to the adjacent part of two rows of exterior wall plates or the outer side of the edge of a single row of exterior wall plates with waterproof glue along the screw position of the exterior wall plates. The improved modular house foundation and wall structure as described in claim 4, wherein the color steel plate has a wavy structure. The improved modular house foundation and wall structure as described in claim 4, wherein the waterproof glue is silicone glue. The improved modular house foundation and wall structure as described in claim 1 or 2, wherein the upper edges of the C-shaped steels are located at the same elevation, the concrete surface is flush with the upper edges of the C-shaped steels, forming a modular house floor, and the bottom of the connecting plate and the concrete surface are tightly connected by nuts and foundation bolts. The improved modular house foundation and wall structure as described in claim 7, wherein the C-shaped steels further include a plurality of triangular diagonal braces, each triangular diagonal brace is formed by obliquely welding two steel bars and inserted into the bearing soil, and each C-shaped steel is welded to the upper ends of at least two triangular diagonal braces, thereby increasing the distance between the elevation of the upper edges of the C-shaped steels and the elevation of the bearing soil surface. The improved modular roof foundation and wall structure as described in claim 1, wherein the outer wall panel comprises: A surface steel plate, along the longer side of the outer wall panel, an anti-expansion groove is formed in the center, one side is recessed inward to form a long joint section, and the other side is folded back to form a long covering section, wherein a locking groove is formed in the long joint section for screws to pass through and the head of the screw does not exceed the long joint section; an inner steel plate, along the outer wall panel In the direction of the longer side, one side is indented inward to form a short joint section, and the other side is folded back to form a short covering section; and a heat insulation layer is formed between the surface steel plate and the inner steel plate, and its material is flame-resistant second-grade polystyrene. When the upper and lower outer wall panels are connected by the longer side, the long covering section covers a part of the long joint section, and the short covering section covers the entire short joint section, and the covered long joint section contains the locking groove.