Heat preservation warm shed for foundation maintenance and building method

Abstract

The invention discloses a heat-preservation warm shed for foundation maintenance and a building method, relates to the technical field of building of heat-preservation warm shed frameworks, and solves the technical problems that after an existing heat-preservation warm shed is built, the structural stability is insufficient, extra reinforcement measures or maintenance work is likely to be needed under the severe weather condition, and the building cost is high. Comprising a steel framework arranged on a foundation platform, and a transparent plastic film is laid on the steel framework; the steel skeleton comprises a bottom steel skeleton and an upper steel skeleton; the bottom steel framework comprises an annular supporting galvanized steel pipe arranged on the foundation platform, a plurality of galvanized oval steel pipes fixedly connected to the annular supporting galvanized steel pipe and 1.5 m phi 25 steel bars connected to the galvanized oval steel pipes and used for fixing. After the building method is adopted, the thermal insulation greenhouse has the advantages of being convenient and fast to mount and dismount, simple and easy to connect and operate, capable of being repeatedly used and firm in framework component.

Description

Technical Field

[0001] The invention belongs to the technical field of building a warming shed, and in particular relates to a warming shed for foundation maintenance and a building method. Background Art

[0002] In today's agricultural production, greenhouse construction has become a common agricultural technology. The construction process includes: 1. Preliminary preparation; 2. Foundation construction; 3. Covering materials; 4. Insulation facilities; 5. Supporting facilities; 6. Subsequent management. The insulation greenhouse mainly plays a supporting role: the insulation greenhouse frame serves as the "skeleton" of the greenhouse, supporting the covering materials and other components of the entire greenhouse to ensure the stability and use function of the greenhouse. Insulation effect: Through reasonable frame design and selection of covering materials, the insulation performance of the greenhouse can be improved, heat loss can be reduced, and energy consumption can be reduced. Wind resistance: The structural design of the frame needs to take into account local wind conditions to ensure that the greenhouse can remain stable in windy weather.

[0003] At present, the following defects are common in the greenhouses on the market: in particular, some low-cost and quick-to-build greenhouses often face the problem of insufficient structural stability after construction. These greenhouses have poor support stability and are less able to withstand severe weather such as wind and snow. When encountering severe weather conditions, they may require additional reinforcement or maintenance work to ensure safety, which undoubtedly increases the cost and complexity of construction and maintenance. Therefore, based on the above problems, a greenhouse for basic maintenance and a construction method are proposed. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a heat preservation shed for foundation maintenance and a construction method, which solves the technical problem that after the existing heat preservation shed is erected, the structure is not stable enough, which may lead to the need for additional reinforcement measures or maintenance work under severe weather conditions, resulting in high construction costs.

[0005] To achieve the above object, according to an embodiment of the first aspect of the present invention, a heat preservation shed for foundation maintenance is provided, comprising a steel frame arranged on a foundation support, wherein a transparent plastic film is laid on the steel frame;

[0006] The steel frame includes a bottom steel frame and an upper steel frame;

[0007] The bottom steel frame includes a ring-shaped supporting galvanized steel pipe arranged on the foundation pedestal, a plurality of galvanized oval steel pipes fixedly connected to the ring-shaped supporting galvanized steel pipe, and a 1.5mΦ25 steel bar connected to each galvanized oval steel pipe for fixing;

[0008] The upper steel frame includes a top pressure ring, a pressure plate connected to the top pressure ring, a number of arched galvanized oval steel pipes fixedly connected to the galvanized oval steel pipe, and a number of inner pressure rings connected to the arched galvanized oval steel pipe. The top pressure ring is located above the annular supporting galvanized steel pipe. The other end of each arched galvanized oval steel pipe is fixedly connected to the edge of the top pressure ring. A Φ steel bar is installed at the connection between each arched galvanized oval steel pipe and the top pressure ring to support the upper weight.

[0009] A method for building a warming shed for basic maintenance, comprising the following steps:

[0010] Step 1: Pre-cast reinforced concrete truncated cone-shaped expansion pedestal as the foundation pedestal, lay a quilt on the foundation pedestal, and install a warm air gun on the lower pedestal slope of the foundation pedestal;

[0011] Step 2: Set up the greenhouse frame on the foundation platform, and the greenhouse frame is installed by auxiliary equipment, including scaffolding, electric wrench, on-site cart and hoisting machine;

[0012] The specific installation steps of the bottom steel frame are as follows:

[0013] a. First install the annular support galvanized steel pipe in the foundation pedestal, then install several bottom brackets on the annular support galvanized steel pipe, and then insert the galvanized oval steel pipe into the bottom bracket. Use oval clamps to reinforce the joints, and use an electric wrench to tighten the screws on the oval clamps at the joints;

[0014] b. Drive 1.5mΦ25 steel bars below the ground at 45° on the outside of each galvanized oval steel pipe every 5m, and then fix the galvanized oval steel pipe to the steel bars with iron wire to form the bottom steel skeleton;

[0015] The specific installation steps of the upper steel frame are as follows:

[0016] d. Use a crane to hoist the top pressure ring, and then install several bottom brackets on the outer edge of the top pressure ring and each galvanized oval steel pipe. Then fix one end of each arched galvanized oval steel pipe in the bottom bracket of each galvanized oval steel pipe, and the other end in the bottom bracket of the top pressure ring. Use an electric wrench to tighten the screws on the arched galvanized oval steel pipe at the connection, and then install the pressure steel plate in the top pressure ring;

[0017] d. Use Φ32 steel bars to insert into the connection between each arched galvanized oval steel pipe and the top pressure ring to support the upper structure, and use them as inclined columns to bear the upper weight; then use an electric wrench to evenly fix multiple oval buckles on each arched galvanized oval steel pipe; then install several inner pressure rings in a group of buckles of the same height in turn, insert bolts to fix, and form the entire greenhouse frame;

[0018] Step 3: Cover the greenhouse frame with two pieces of transparent plastic films, wrap them with mesh ropes after laying, and compact the bottom with earthbags to form the entire warm greenhouse.

[0019] A performance testing method for a heat preservation shed for foundation maintenance is used to test the performance of the heat preservation shed for foundation maintenance, including stability calculation of a steel frame and heat load calculation of the shed. The stability calculation of the steel frame includes frame bearing capacity calculation and steel frame live load calculation. The steel frame live load calculation includes constant load calculation, wind load calculation and snow load calculation. The heat load calculation of the shed includes basic heat transfer capacity of the shed, cold wind penetration heat load of the shed and total heating heat load of the shed.

[0020] A further improvement is that the skeleton bearing capacity is calculated according to the following expression:

[0021] P = A × B;

[0022] Among them, P is the skeleton bearing capacity; A is the maximum pressure that the steel pipe can withstand per unit area; B is the cross-sectional area of ​​the steel pipe;

[0023] A further improvement is that the dead load is calculated according to the following expression:

[0024] G k =γ g G;

[0025] Among them, G k is the standard value of the dead load; g is the load factor; G is the design load.

[0026] A further improvement is that the steel skeleton wind load is calculated according to the following expression:

[0027] W k =β z μ s μ z W o ;

[0028] Among them, W k is the standard value of wind load; β z is the wind vibration coefficient; μ s is the wind load shape coefficient; μ z W is the wind pressure height variation coefficient; o The basic wind pressure.

[0029] A further improvement is that the snow load on the steel skeleton is calculated according to the following expression:

[0030] S k =μ r S o ;

[0031] Among them, S k is the standard value of snow load; μ r is the snow distribution coefficient; S o Basic snow pressure.

[0032] A further improvement is that the basic heat transfer capacity of the greenhouse is calculated according to the following expression:

[0033] Q1=∑K1F1(T n -T W );

[0034] Among them, Q1 is the total heat transfer of the greenhouse; K1 is the heat transfer coefficient; F1 is the heat transfer area; T n ,T W The temperature inside and outside the shed.

[0035] A further improvement is that the cold air infiltration heat load of the greenhouse is calculated according to the following expression:

[0036] Q2=C p NVγ(T n -T W );

[0037] Among them, Q2 is the cold wind penetration loss of the greenhouse; C p is the constant pressure specific heat of air; N is the heat exchange rate between the greenhouse and the outside air; V is the internal volume of the greenhouse; γ is the specific gravity of air.

[0038] A further improvement is that the total heating heat load of the greenhouse is calculated according to the following expression:

[0039] Q = α1α2Q1+Q2;

[0040] Among them, α1 is the structural additional coefficient; α2 is the structural additional coefficient.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention cleverly installs the entire greenhouse structure on the foundation pedestal, and specifically subdivides the steel frame structure of the greenhouse into two major parts: a bottom steel frame and an upper steel frame. The bottom steel frame uses several galvanized oval steel pipes and several annular support galvanized steel pipes, and the upper steel frame uses several arched galvanized oval steel pipes as the entire frame. A plurality of internal pressure-bearing rings for bearing pressure are arranged inside, and a pressure-bearing steel plate is installed in the top pressure-bearing ring on the top. After the construction is completed, the stability of the overall structure is effectively improved, and it is not easy to collapse after rain and snow accumulation, which significantly improves the ability to resist wind and snow without the need for additional reinforcement means or maintenance operations. In addition, the greenhouse structure of the present invention uses galvanized steel pipes as the main material, which not only gives the greenhouse structure excellent rust and corrosion resistance, but also makes each component extremely strong and durable, and each component is light, easy to transfer, and can be reused.

[0043] When the greenhouse is built, the greenhouse effect can be fully utilized during the day to maintain the temperature in the greenhouse within the ideal range of 16°C to 30°C. At the same time, water droplets formed in the greenhouse will naturally drip onto the quilt of the foundation, thereby cleverly adjusting the indoor humidity to maintain it in a comfortable range of 45% to 65%. At night, the temperature in the greenhouse is maintained at 16°C to 30°C by activating the heating gun, ensuring suitable environmental conditions all day long. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the overall structure of the warming shed of the present invention;

[0045] Figure 2 It is a schematic diagram of the structure of the warming shed from above according to the present invention.

[0046] Markings in the figure:

[0047] 1. Galvanized oval steel pipe; 11. Annular support galvanized steel pipe; 2. Inner pressure ring; 21. Arched galvanized oval steel pipe; 22. Top pressure ring; 23. Pressure plate; 3. Foundation pedestal. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] like Figure 1 and Figure 2 As shown, a steel frame of a heat preservation shed for foundation maintenance is arranged on a foundation bearing platform 3, and a transparent plastic film is laid on the steel frame;

[0050] The steel frame includes a bottom steel frame and an upper steel frame;

[0051] The bottom steel frame includes a ring-shaped supporting galvanized steel pipe 11 arranged on the foundation pedestal 3, a plurality of galvanized oval steel pipes 1 fixedly connected to the ring-shaped supporting galvanized steel pipe 11, and a 1.5mΦ25 steel bar connected to each galvanized oval steel pipe 1 for fixing;

[0052] The upper steel frame includes a top pressure ring 22, a pressure plate 23 connected to the top pressure ring 22, a plurality of arched galvanized oval steel pipes 21 fixedly connected to the galvanized oval steel pipe 1, and a plurality of inner pressure rings 2 connected to the arched galvanized oval steel pipe 21. The top pressure ring 22 is located above the annular supporting galvanized steel pipe 11. The other end of each arched galvanized oval steel pipe 21 is fixedly connected to the edge of the top pressure ring 22. A Φ32 steel bar is installed at the connection between each arched galvanized oval steel pipe 22 and the top pressure ring 2 to support the upper weight. By cleverly connecting the entire greenhouse structure It is cleverly installed on the foundation pedestal, and the steel frame structure of the greenhouse is specifically subdivided into two parts: the bottom steel frame and the upper steel frame. The bottom steel frame uses several galvanized oval steel pipes and several annular support galvanized steel pipes. The upper steel frame uses several arched galvanized oval steel pipes as the entire frame. Multiple internal pressure rings for pressure bearing are arranged inside, and a pressure steel plate is installed in the top pressure ring on the top. After the construction is completed, the stability of the overall structure is effectively improved, and it is not easy to collapse after rain and snow accumulation. The ability to resist wind and snow is significantly improved without the need for additional reinforcement means or maintenance operations. In addition, the greenhouse structure of the present invention uses galvanized steel pipes as the main material, which not only gives the greenhouse structure excellent rust and corrosion resistance, but also makes each component extremely strong and durable, and each component is light, easy to transfer, and can be reused.

[0053] A method for building a warming shed for basic maintenance, comprising the following steps:

[0054] Step 1: Pre-cast a reinforced concrete truncated cone-shaped extension cap as the foundation cap 3, lay a quilt on the foundation cap 3, and install a warm air gun on the lower cap slope of the foundation cap 3;

[0055] Step 2: Build a greenhouse frame on the foundation pedestal 3, and the greenhouse frame is installed by auxiliary equipment, including scaffolding, electric wrench, on-site cart and hoisting machine;

[0056] Among them, the specific installation steps of the bottom steel frame are as follows:

[0057] a. First, install the annular support galvanized steel pipe 11 in the foundation pedestal 3, then install several bottom brackets on the annular support galvanized steel pipe 11, and then insert the galvanized oval steel pipe 1 into the bottom bracket. Use oval clamps to reinforce the joints, and use an electric wrench to tighten the screws on the oval clamps at the joints;

[0058] b. Drive 1.5mΦ25 steel bars below the ground at 45° on the outside of each galvanized oval steel pipe 1 every 5m, and then fix the galvanized oval steel pipe 1 to the steel bars with iron wire to form a bottom steel skeleton;

[0059] The specific installation steps of the upper steel frame are as follows:

[0060] d. Use a crane to hoist the top pressure ring 22, and then install several bottom brackets on the outer edge of the top pressure ring 22 and each galvanized oval steel pipe 1, and then fix one end of each arched galvanized oval steel pipe 21 to the bottom bracket of each galvanized oval steel pipe 1, and the other end to the bottom bracket of the top pressure ring 22. Use an electric wrench to tighten the screws to the arched galvanized oval steel pipe 21 at the connection, and then install the pressure steel plate 23 in the top pressure ring 22;

[0061] d. Use Φ32 steel bars to insert into the connection between each arched galvanized oval steel pipe 21 and the top pressure ring 22 to support the upper structure, and serve as inclined columns to bear the upper weight; then use an electric wrench to evenly fix multiple oval buckles on each arched galvanized oval steel pipe 22; then install several inner pressure rings 2 in a group of buckles of equal height in turn, insert bolts to fix, and form the entire greenhouse frame;

[0062] Step 3: Cover the greenhouse frame with two pieces of transparent plastic film, wrap them with mesh ropes after laying, and compact the bottom with earthbags to form the entire warm greenhouse.

[0063] It should be noted that the overlap length of the transparent plastic film is 1m, and the overlap is connected to the rigid frame with ropes. The joints must be tight and airtight to ensure that the overlap is not damaged by wind and the transparent plastic film. After the transparent plastic film is installed, it is wrapped with a grid rope and compacted with earth bags at the bottom to prevent wind from damaging the transparent plastic film;

[0064] The auxiliary equipment used in the application documents during construction includes scaffolding, electric wrenches, on-site carts, hoisting machines, etc. After construction, the heat preservation shed is cylindrical at the bottom and conical at the top, with a height of 5.2m and a diameter of 22m. During transportation, the transparent plastic film should be wrapped with soft cloth to prevent scratches and injuries from hard objects. The transparent plastic film should be stored in a shaded location before installation and use, and should not exceed 6 months. If installed in winter, the transparent plastic film should be placed at room temperature for 2-3 days before installation. Before installing the transparent plastic film, check whether there are burrs on the parts that are in direct contact with the film, such as the skeleton and connectors. If there are burrs, they should be polished to prevent scratches on the film.

[0065] Install the transparent plastic film in a light windy day to prevent damage to the transparent plastic film. When pulling or unfolding the transparent plastic film, avoid excessive force to prevent the transparent plastic film from scraping on the greenhouse components, thereby causing damage to the transparent plastic film. After installation, the transparent plastic film must be kept at a certain tension, and the plastic film must be flat and not twisted. The transparent plastic film must have a uniform tightness to prevent friction and collision with the components, and to prevent the film from breaking due to contraction or snow accumulation in cold seasons.

[0066] References to construction standards: "Winter Construction Code for Building Engineering" JGJ / T 104-2011, "Code for Loads on Building Structures" GB 50009-2012, "Semi-shed Plastic Greenhouse" JB / T 6942-2007, "Construction Standards for Solar Greenhouses" NY / T 3024-2016, "Technical Conditions for Solar Greenhouses" JB / T10286-2013, "Technical Code for Steel Pipe Structures" CECS280-2010 and "Construction Safety Inspection Standards" JGJ59-2011.

[0067] A performance testing method for a heat preservation shed for foundation maintenance is used to test the performance of a heat preservation shed for foundation maintenance, including the stability calculation of a steel frame and the heat load calculation of the shed. The stability calculation of the steel frame includes the frame bearing capacity calculation and the steel frame live load calculation. The steel frame live load calculation includes the constant load calculation, the wind load calculation and the snow load calculation. The heat load calculation of the shed includes the basic heat transfer capacity of the shed, the cold wind penetration heat load of the shed and the total heating heat load of the shed.

[0068] It should be noted that the standard values ​​of wind loads are as follows:

[0069] The wind pressure height variation coefficient is taken according to the Class B ground roughness, which is μ z =1.00, the basic wind pressure in the area ω o =0.35kN / m 2 ; Since the height of the greenhouse is less than 30m and the aspect ratio is less than 1.5, β Z =1.00

[0070] The standard value of wind load is calculated according to the following expression:

[0071] ω k =β z μ s μ z ω o

[0072] Windward side: ω k1 =1×1×0.8×0.35=0.28kN / m 2

[0073] q1=0.28×16.6=4.65kN / m

[0074] Leeward side:

[0075] q2=0.175×16.6=2.91kN / m

[0076] The wind load acting on the top of the greenhouse is: W = 0.8 × 0.35 × 115.48 + 0.5 × 0.35 × 115.48 + (-1.2 + 0.5) × 1 × 0.35 × 115.48 = 24.25 kN.

[0077] The standard value of snow load is calculated according to the following expression:

[0078] Basic snow pressure: S o =0.35KN / ㎡

[0079] Snow load standard value: S k =μ r S o

[0080] S k =μ r S o =0.6×0.35=0.21kN / ㎡

[0081] q=0.21×16.6=3.49kN / m

[0082] Snow load acting on the top of the greenhouse: W = 0.21 × 230.95 = 48.5 kN.

[0083] The following is a calculation of the stability of the steel skeleton with specific parameters, as follows:

[0084] The frame bearing capacity is calculated as follows:

[0085] P = A × B;

[0086] Among them, P is the skeleton bearing capacity; A is the maximum pressure that the steel pipe can withstand per unit area; B is the cross-sectional area of ​​the steel pipe;

[0087] P=500MPa×554.5mm 2 / 1000=227.24kN.

[0088] Therefore, it is concluded that the maximum pressure that the skeleton can withstand is 227.24 kilonewtons;

[0089] The dead load is calculated as follows:

[0090] G k =γ g G;

[0091] Among them, Gk is the standard value of dead load, KN / ㎡; ​​γ g is the load factor, take 0.025; G is the design load, take 0.8KN / ㎡;

[0092] After calculation, we know that: After calculation, we know that G k =0.025×0.8=0.02KN / ㎡.

[0093] The wind load on the steel skeleton is calculated according to the following expression:

[0094] W k =β z μ s μ z W o ;

[0095] Among them, W k is the standard value of wind load, KN / ㎡; ​​β z is the wind vibration coefficient, take 0.6; μ s is the wind load shape coefficient, which is taken as 0.2; μ z is the wind pressure height variation coefficient, which is taken as 2.91; W o The basic wind pressure is 0.3KN / ㎡.

[0096] The snow load on the steel skeleton is calculated according to the following expression:

[0097] S k =μ r S o ;

[0098] Among them, S k is the standard value of snow load, KN / ㎡; ​​μ r is the snow distribution coefficient, which is taken as 0.6; S o is the basic snow pressure, take 0.25KN / ㎡;

[0099] It can be calculated that S k =0.6×0.25=0.15KN / ㎡;

[0100] Total frame load = G k +W k +S k =0.28KN / ㎡

[0101] The total area of ​​the skeleton is 493.13 m2.

[0102] Therefore, the total load of the frame = 0.28 × 493.13 = 138.0 kN < 227.24 kN.

[0103] In summary, the stability of the greenhouse meets the requirements.

[0104] The following is a calculation of the heat load of the greenhouse with specific parameters, as follows:

[0105] The basic heat transfer of the greenhouse is calculated according to the following expression:

[0106] Q1=∑K1F1(T n -T W );

[0107] Among them, Q1 is the total heat transfer of the greenhouse, W; K1 is the heat transfer coefficient, and the transparent plastic film is taken as 1.2W / (㎡K); F1 is the heat transfer area, ㎡; T n ,T W is the temperature inside and outside the greenhouse, specifically: T n Take the average temperature as 23℃, T W Take the lowest outdoor temperature as -15℃;

[0108] After calculation, F1 = 89.85m 2 +403.28m 2 =493.13m 2 ;

[0109]

[0110] The cold air infiltration heat load of the greenhouse is calculated according to the following expression:

[0111] Q2=C p NVγ(T n -T W );

[0112] Among them, Q2 is the cold wind penetration loss of the greenhouse, W; C p is the constant pressure specific heat of air, C p =0.279Wh / (Kg℃); N is the heat exchange rate between the greenhouse and the outside air, N=0.8; V is the internal volume of the greenhouse, m 3 ; γ is the specific gravity of air, γ = 1.365 kg / m 3 ;

[0113] After calculation, V = 494.17m 3 +570.75m 3 =1064.92m 3 ;

[0114] Q2=0.279W h / (Kg℃)×0.8×1064.92m 3 ×1.365kg / m 3 ×[23℃-(-15℃)]=12.32Kw.

[0115] The total heating heat load of the greenhouse is calculated as follows:

[0116] Q = α1α2Q1+Q2;

[0117] Among them, α1 is the structural additional coefficient; α2 is the structural additional coefficient.

[0118] After calculation, Q = 1.02 × 1 × 20.99Kw + 12.32Kw = 33.73Kw

[0119] In summary, the heating meets the requirements.

[0120] In this embodiment, it is also necessary to explain that cameras are installed inside and outside the shed in the application document to monitor the on-site conditions and the temperature inside the shed in real time. Remote monitoring is unmanned. During the heating process in the shed at night, construction workers are strictly prohibited from entering the shed without wearing gas masks to prevent accidents.

[0121] When the greenhouse is built, compared with the construction standard, the overall structural stability of the heat preservation greenhouse of the present invention is effectively improved, and it is not easy to collapse after rain and snow accumulation, which significantly improves the ability to resist wind and snow without the need for additional reinforcement or maintenance. In addition, the greenhouse structure of the present invention uses galvanized steel pipes as the main material, which not only gives the greenhouse structure excellent rust and corrosion resistance, but also makes each component extremely strong and durable, and each component is light, easy to transfer, and can be reused.

[0122] When the greenhouse is built, the greenhouse effect can be fully utilized during the day to maintain the temperature in the greenhouse within the ideal range of 16°C to 30°C. At the same time, water droplets formed in the greenhouse will naturally drip onto the quilt of the foundation, thereby cleverly adjusting the indoor humidity to maintain it in a comfortable range of 45% to 65%. At night, the temperature in the greenhouse is maintained at 16°C to 30°C by activating the heating gun, ensuring suitable environmental conditions all day long.

[0123] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A heat preservation shed for basic maintenance, characterized in that: It comprises a steel frame, which is arranged on a foundation support (3), and a transparent plastic film is laid on the steel frame; The steel frame includes a bottom steel frame and an upper steel frame; The bottom steel frame comprises an annular support galvanized steel pipe (11) arranged on the foundation pedestal (3), a plurality of galvanized oval steel pipes (1) fixedly connected to the annular support galvanized steel pipe (11), and 1.5 m Φ25 steel bars connected to each galvanized oval steel pipe (1) for fixing; The upper steel frame comprises a top pressure ring (22), a pressure plate (23) connected to the top pressure ring (22), a plurality of arched galvanized oval steel pipes (21) fixedly connected to the galvanized oval steel pipe (1), and a plurality of inner pressure rings (2) connected to the arched galvanized oval steel pipe (21). The top pressure ring (22) is located above the annular supporting galvanized steel pipe (11). The other end of each arched galvanized oval steel pipe (21) is fixedly connected to the edge of the top pressure ring (22). A Φ32 steel bar is installed at the connection between each arched galvanized oval steel pipe (21) and the top pressure ring (22) for supporting the upper weight.

2. The method for constructing a heat preservation shed for foundation maintenance according to claim 1, characterized in that: The steps include: The first step is to pre-cast a reinforced concrete truncated cone-shaped expansion pedestal as a foundation pedestal (3), lay a quilt on the foundation pedestal (3), and install a warm air gun on the lower pedestal slope of the foundation pedestal (3); Step 2: erecting a greenhouse frame on the foundation support (3), the greenhouse frame being installed by auxiliary equipment, the auxiliary equipment including a scaffold, an electric wrench, a field cart and a hoist; The specific installation steps of the bottom steel frame are as follows: a. First, install the annular support galvanized steel pipe (11) in the foundation pedestal (3), then install a number of bottom brackets on the annular support galvanized steel pipe (11), and then insert the galvanized oval steel pipe (1) into the bottom brackets. Use oval clamps to reinforce the joints, and use an electric wrench to tighten the screws on the oval clamps at the joints; b. Drive 1.5m Φ25 steel bars below the ground at 45° on the outside of each galvanized oval steel pipe (1) every 5m, and then fix the galvanized oval steel pipe (1) to the steel bars with iron wire to form a bottom steel skeleton; The specific installation steps of the upper steel frame are as follows: d. Use a crane to hoist the top pressure ring (22), and then install a number of bottom brackets on the outer edge of the top pressure ring (22) and on each galvanized oval steel pipe (1), and then fix one end of each arched galvanized oval steel pipe (21) to the bottom bracket of each galvanized oval steel pipe (1), and the other end to the bottom bracket of the top pressure ring (22). Use an electric wrench to tighten the screws on the arched galvanized oval steel pipe (21) at the connection, and then install the pressure steel plate (23) in the top pressure ring (22); d. Use Φ32 steel bars to insert into the connection between each arched galvanized oval steel pipe (21) and the top pressure ring (22) to support the upper structure, and use them as inclined columns to bear the upper weight; then use an electric wrench to evenly fix multiple oval buckles on each arched galvanized oval steel pipe (22); then install several inner pressure rings (2) in sequence in a group of buckles of the same height, insert bolts to fix them, and form the entire greenhouse frame; Step 3: Cover the greenhouse frame with two pieces of transparent plastic film, wrap them with mesh ropes after laying, and compact the bottom with earthbags to form the entire warm greenhouse.

3. A performance testing method for a heat preservation shed for foundation maintenance, used to test the performance of a heat preservation shed for foundation maintenance according to claim 1, characterized in that: It includes the stability calculation of the steel frame and the heat load calculation of the greenhouse. The stability calculation of the steel frame includes the frame bearing capacity calculation and the steel frame live load calculation. The steel frame live load calculation includes the constant load calculation, wind load calculation and snow load calculation. The heat load calculation of the greenhouse includes the basic heat transfer of the greenhouse, the cold air penetration heat load of the greenhouse and the total heating heat load of the greenhouse.

4. The method for constructing a heat preservation shed for foundation maintenance according to claim 3, characterized in that: The skeleton bearing capacity is calculated according to the following expression: P = A × B; Among them, P is the bearing capacity of the skeleton; A is the maximum pressure that the steel pipe can withstand per unit area; B is the cross-sectional area of ​​the steel pipe.

5. A heat preservation shed and construction method for foundation maintenance according to claim 3, characterized in that: The dead load is calculated as follows: G k =c g G; Among them, G k is the standard value of the dead load; g is the load factor; G is the design load.

6. A heat preservation shed and construction method for foundation maintenance according to claim 3, characterized in that: The steel skeleton wind load is calculated according to the following expression: W k =b z m s m z W o ; Among them, W k is the standard value of wind load; β z is the wind vibration coefficient; μ s is the wind load shape coefficient; μ z W is the wind pressure height variation coefficient; o The basic wind pressure.

7. The method for constructing a heat preservation shed for foundation maintenance according to claim 3, characterized in that: The snow load on the steel skeleton is calculated according to the following expression: S k =μ r S o ; Among them, S k is the standard value of snow load; μ r is the snow distribution coefficient; S o Basic snow pressure.

8. The method for constructing a heat preservation shed for foundation maintenance according to claim 3, characterized in that: The basic heat transfer of the greenhouse is calculated according to the following expression: Q1=∑K1F1(T n -T W ); Among them, Q1 is the total heat transfer of the greenhouse; K1 is the heat transfer coefficient; F1 is the heat transfer area; T n ,T W The temperature inside and outside the shed.

9. The method for constructing a heat preservation shed for foundation maintenance according to claim 3, characterized in that: The cold air infiltration heat load of the greenhouse is calculated according to the following expression: Q2=C p NVγ(T n -T W ); Among them, Q2 is the cold wind penetration loss of the greenhouse; C p is the constant pressure specific heat of air; N is the heat exchange rate between the greenhouse and the outside air; V is the internal volume of the greenhouse; γ is the specific gravity of air.

10. The method for constructing a heat preservation shed for foundation maintenance according to claim 3, characterized in that: The total heating heat load of the greenhouse is calculated according to the following expression: Q = α1α2Q1+Q2; Among them, α1 is the structural additional coefficient; α2 is the structural additional coefficient.

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