Tire mold structure, construction method thereof, and method for constructing concrete foundation of foundation pit

Abstract

The application discloses a formwork structure and a construction method thereof and a foundation pit concrete foundation construction method, wherein the formwork structure is used for foundation pit concrete foundation pouring and comprises a foundation formwork and a tension anchor assembly. The foundation formwork comprises side plates, the side plates comprise a plurality of plate bodies, the side plates are enclosed to form a first mold cavity, and the first mold cavity is used for concrete foundation pouring; the tension anchor assembly comprises a tensioning piece, a stand column and an adjusting device, the stand column is connected between adjacent plate bodies of the side plates, a lower end of the stand column can be inserted into a pit bottom, an upper end of the stand column is connected with the adjusting device, one end of the tensioning piece is connected with an adjusting piece of the adjusting device, the other end of the tensioning piece is connected with the pit bottom of the foundation pit and is located outside the first mold cavity, when the adjusting piece moves, the side plates can be offset in a direction away from the first mold cavity, the size precision of the first mold cavity is improved, the size parameter after concrete pouring is ensured, and the safety of the concrete foundation is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building, in particular to a formwork structure, a construction method thereof and a construction method of a foundation pit concrete foundation. BACKGROUND

[0002] At present, when pouring a concrete foundation in a foundation pit, a brick formwork is usually built by using cement and other cementitious materials. Cement and other cementitious materials need a long setting time to reach a certain strength, and then the formwork can be filled with soil outside the formwork under the condition of supporting inside the formwork. In order to shorten the construction period, a prefabricated plate is used to replace the brick formwork in the related technology. However, the prefabricated plate is prone to deformation and displacement when subjected to lateral pressure of backfill soil, which causes the deformation of the formwork cavity, and thus leads to size deviation of the poured and solidified concrete foundation, causing safety hazards. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a formwork structure which can be used for pouring a concrete foundation in a foundation pit and improves the safety of the concrete foundation.

[0004] The present application also provides a formwork construction method.

[0005] The present application also provides a construction method of a foundation pit concrete foundation.

[0006] According to the formwork structure of the first aspect of the present application, the formwork structure is used for pouring a concrete foundation in a foundation pit, and comprises:

[0007] a foundation formwork, the foundation formwork comprising a side plate, the side plate comprising a plurality of plate bodies connected in sequence, the side plate being enclosed to form a first formwork cavity, the first formwork cavity being used for pouring a concrete foundation;

[0008] a tensioning and anchoring assembly, the tensioning and anchoring assembly comprising a tensioning member, a stand column and an adjusting device, the stand column being connected between adjacent plate bodies of each side plate, a lower end of the stand column being capable of being inserted into a pit bottom, an upper end of the stand column being further provided with an adjusting groove, both side walls of the adjusting groove being provided with connecting holes, the adjusting device comprising a first connecting member and an adjusting member, the first connecting member being connected into the adjusting groove through the connecting holes, the adjusting member being connected to the first connecting member, the adjusting member being capable of moving towards the first formwork cavity relative to the first connecting member, one end of the tensioning member being connected to the adjusting member, the other end of the tensioning member being connected to the pit bottom of the foundation pit and located outside the first formwork cavity, and when the adjusting member moves, the side plate is capable of deviating from the first formwork cavity.

[0009] According to the formwork structure of the present application, at least the following beneficial effects are achieved:

[0010] When backfilling soil into the foundation pit, the soil will generate a lateral force on the side plate towards the first mold cavity, since the upright column in the anchor assembly is connected between adjacent plate bodies and the lower end of the upright column can be inserted into the pit bottom, the lower end of the upright column can limit the deformation of the lower end of the side plate, the upper end of the upright column is connected to one end of the tensioning member, and the other end of the tensioning member is connected to the pit bottom outside the first mold cavity, so that the tensioning member can provide a lateral force on the side plate towards the outside of the first mold cavity to offset the pressure generated by the backfilling soil, thereby limiting the deformation of the side plate, and after backfilling the soil, the position of the side plate can be adjusted by the adjusting member to improve the size accuracy of the first mold cavity, so as to ensure the size parameters after pouring the concrete foundation, thereby improving the safety of the concrete foundation.

[0011] According to some embodiments of the present application, the anchor assembly further comprises a support member, one end of the support member abutting against the pit bottom of the foundation pit, and the other end abutting against the side surface of the tensioning member.

[0012] According to some embodiments of the present application, the anchor assembly further comprises a ground anchor member, the tensioning member being connected to the ground anchor member, and the backfilling soil of the foundation pit being capable of pressing the ground anchor member to make the ground anchor member tightly abut against the pit bottom.

[0013] According to some embodiments of the present application, the foundation mold comprises a plurality of the side plates, and the first end and the tail end of each side plate are detachably connected.

[0014] According to some embodiments of the present application, the upright column is made of H steel, and the flanges of the H steel define two mounting grooves facing in opposite directions, and the opposite end portions of the two adjacent plate bodies in the horizontal direction are respectively inserted into the two opposite mounting grooves.

[0015] According to some embodiments of the present application, a second connecting member is further included, the second connecting member comprising a first connecting portion and a second connecting portion, the first connecting portion having a first limiting hole, and the second connecting portion having a second limiting hole, the side plate being provided with a limiting portion, the limiting portions on the two adjacent side plates being respectively detachably inserted into the first limiting hole and the second limiting hole, and the hole walls of the first limiting hole and the second limiting hole abutting against the side surface of the limiting portion to tightly connect the adjacent side plates.

[0016] The tire mold construction method of the second aspect embodiment of the present application is used to build the tire mold structure of the first aspect embodiment, and comprises the following steps:

[0017] Excavating a foundation pit;

[0018] Setting the foundation mold on the pit bottom of the foundation pit;

[0019] Setting the anchor assembly;

[0020] Backfilling soil outside the first mold cavity;

[0021] Move the adjusting member in the anchor assembly to adjust the position of the side plate.

[0022] The formwork construction method according to embodiments of the present invention has at least the following beneficial effects: the completed formwork structure is used for the pouring of concrete foundation for the foundation pit, thereby improving the safety of the concrete foundation for the foundation pit.

[0023] The method for constructing a concrete foundation pit according to a third aspect of the present invention includes the following steps:

[0024] The tire mold structure was constructed based on the tire mold construction method described in the second aspect embodiment;

[0025] A layer of unreinforced concrete is poured at the bottom of the first mold cavity to seal it;

[0026] Reinforcing bars are installed inside the first mold cavity;

[0027] Concrete is poured into the first mold cavity.

[0028] The foundation pit concrete foundation construction method according to embodiments of the present invention has at least the following beneficial effects:

[0029] Because the mold structure built using the mold construction method described in the second aspect has higher dimensional accuracy, the concrete foundation has higher dimensional accuracy and higher safety.

[0030] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description and will be learned by practice of the invention. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0032] Figure 1 This is a schematic diagram of the tire mold structure according to a first aspect embodiment of the present invention;

[0033] Figure 2 for Figure 1 Schematic diagram of the center anchor assembly;

[0034] Figure 3 for Figure 2 Another perspective illustration;

[0035] Figure 4 for Figure 3 Enlarged view of region A in the middle;

[0036] Figure 5 This is a schematic diagram of the second connector and the side plate;

[0037] Figure 6 Schematic diagram of the third connector, connecting device, and side plate;

[0038] Figure 7 This is a flowchart of a method for constructing a model according to a second aspect of the present invention.

[0039] Figure label:

[0040] The components include: base mold 100, side plate 110, limiting part 111, first surface 112, second surface 113, third surface 114, fourth surface 115, plate body 116, mounting hole 117, and first mold cavity 120.

[0041] Anchor assembly 200, tensioning component 210, column 220, adjusting groove 221, mounting groove 222, adjusting device 230, first connecting component 231, adjusting component 232, supporting component 240, ground anchor component 250;

[0042] Second connector 300, first connecting part 310, first limiting hole 311, second connecting part 320, second limiting hole 321;

[0043] Third connector 400, first abutment 410, first through hole 411, second abutment 420, third abutment 430;

[0044] Center pad 500, corner pad 600;

[0045] Ground beam mold 700, second mold cavity 710;

[0046] Connecting device 800, expansion screw 810, expansion pin 820, second through hole 821, locking nut 830. Detailed Implementation

[0047] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0048] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0049] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0050] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0051] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] Figure 1 This is a tire mold structure according to a first aspect embodiment of the present invention. Figure 2 for Figure 1 Schematic diagram of the middle anchor component. Figure 3 for Figure 2 Another perspective illustration, Figure 4 for Figure 3 A magnified diagram of region A in the middle, refer to... Figures 1 to 4 The concrete foundation formwork of this embodiment is used for pouring concrete foundation for foundation pits and includes: foundation formwork 100 and anchor assembly 200.

[0053] The base mold 100 includes side plates 110, each side plate 110 comprising multiple sequentially connected plates 116. The side plates 110 enclose a first mold cavity 120 for concrete foundation pouring. The anchor assembly 200 includes a tensioning element 210 (such as a rope), a column 220, and an adjustment device. The column 220 is connected between adjacent plates 116 of each side plate, and the lower end of the column 220 can be inserted into the bottom of the pit. The tensioning element 210 is connected to the upper end of the column 220. The upper end of the column 220 is also provided with an adjustment groove 221. The two side walls of the adjustment groove 221 have connection holes. The adjustment device 230 includes a first connector 231 and an adjustment member 232. The first connector 231 is connected to the adjustment groove 221 through the connection hole. The adjustment member 232 is connected to the first connector 231. The adjustment member 232 can move relative to the first connector 231 toward the first mold cavity 120. One end of the tensioning member 210 is connected to the adjustment member 232, and the other end is connected to the bottom of the pit and located outside the first mold cavity 120. When the adjustment member 232 moves, the side plate 110 can shift away from the first mold cavity 120.

[0054] Specifically, during construction, excavation and erection can be carried out simultaneously. That is, while excavating the foundation pit, a formwork structure can be erected at the corresponding location, and backfilling can begin immediately after construction. When backfilling soil into the foundation pit, the soil exerts a lateral force on the side plate 110 towards the mold cavity, causing deformation of the first mold cavity 120. This results in deviations in the dimensions of the concrete foundation after pouring, creating a safety hazard. To improve the safety of the concrete foundation, this embodiment includes an anchoring assembly 200. One end of the tensioning member 210 in the anchoring assembly 200 is connected to the side plate 110, and the other end is connected to the bottom of the pit outside the first mold cavity 120. Therefore, the tensioning member 210 can provide a lateral force on the side plate 110 towards the outside of the first mold cavity 120 to counteract the pressure exerted by the backfill soil, thereby limiting the deformation of the side plate 110, ensuring the dimensional parameters of the concrete foundation after pouring, and improving the safety of the concrete foundation.

[0055] When the side plate 110 is subjected to lateral pressure from the backfill soil, it will undergo flexural deformation. According to engineering mechanics, the deflection (maximum deformation) is related to the length of the side plate 110; under the same pressure, the longer the side plate 110, the greater the deflection. Therefore, in this embodiment, the side plate 110 is divided into multiple plates 116 to reduce the deformation of the side plate 110. Adjacent plates 116 are connected by columns 220, with the lower end of the columns 220 inserted into the bottom of the pit and the upper end connected to a tensioning member 210. Therefore, after the pit is backfilled with soil, the columns 220 can apply a horizontally distributed force to the plates 116 in the vertical direction to counteract the lateral force of the backfill soil, thereby reducing the displacement and deformation of the plates 116. It is understandable that the lateral force exerted by the column 220 on the plate 116 is equivalent to the tension exerted by multiple tensioning members 210 on the plate 116 at the same time. Therefore, this embodiment uses the column 220 to connect the plate 116, which is simple in structure and easy to assemble.

[0056] During construction, when the side plate 110 is subjected to the lateral force of the backfill soil, it will still undergo lateral deformation due to the elasticity of the tensioner 210 itself. In this embodiment, the adjustment device 230 can adjust the position of the side plate 110 by moving the adjustment member 232, keeping the first mold cavity 120 within its designed dimensions. The side of the first connecting member 231 may have threads, and the adjustment member 232 can use a nut. The nut is fitted onto the first connecting member 231. Rotating the nut can move the tensioner 210 towards the inside of the first mold cavity 120, correspondingly moving the side plate 110 towards the outside of the first mold cavity 120 to adjust the position and shape of the side plate 110.

[0057] In some embodiments, the anchor assembly 200 further includes a support member 240, one end of which abuts against the bottom of the foundation pit, and the other end of which abuts against the side of the tensioning member 210. Specifically, by placing the support member 240 under the tensioning member 210, the tensioning member 210 can be prevented from being bent during the compaction of the backfill soil outside the formwork, thereby protecting the foundation formwork 100 from being pulled down.

[0058] Reference Figures 1 to 4 In some embodiments, the anchor assembly 200 further includes a ground anchor 250, to which a tensioning member 210 is connected. Backfill soil from the pit can be pressed onto the ground anchor 250, ensuring it is tightly attached to the pit bottom. Typically, connecting the tensioning member 210 to the pit bottom requires pouring concrete at the bottom and then connecting the tensioning member 210 to the concrete; however, concrete requires time to harden. To shorten construction time, the ground anchor 250 is connected to the end of the tensioning member 210 that connects to the pit bottom, with the ground anchor 250 having a larger upward-facing surface area. During construction, it is only necessary to place the ground anchor 250 at the pit bottom and then backfill the pit with soil, using the weight of the backfill soil to firmly press the ground anchor 250 against the pit bottom.

[0059] Reference Figure 1 In some embodiments, the base mold 100 includes multiple side panels 110, with the ends of each side panel 110 detachably connected. Specifically, the side panels 110 can be made of common prefabricated panels, and the base mold 100 can be formed by detachably assembling the side panels 110, resulting in a simple structure that is convenient for assembly, transportation, and storage.

[0060] Reference Figures 2 to 4 In some embodiments, the column 220 is made of H-steel, and the flanges of the H-steel define two oppositely oriented mounting grooves 222. The oppositely oriented ends of two adjacent plates 116 in the horizontal direction are respectively inserted into the two oppositely oriented mounting grooves 222. Specifically, by using H-steel to form the column 220, the side plate 110 can be snapped between the two flanges of the H-steel without the need for additional connecting structures, saving manufacturing costs and shortening the processing cycle of the column 220.

[0061] Reference Figure 5 , Figure 5 This is a schematic diagram of the second connector and side plate. The dashed lines in the diagram are assembly guide lines to facilitate structural explanation. In some embodiments, the concrete foundation formwork also includes a second connector 300, which includes a first connecting portion 310 and a second connecting portion 320. The first connecting portion 310 has a first limiting hole 311, and the second connecting portion 320 has a second limiting hole 321. The side plate 110 is provided with limiting portions 111. The limiting portions 111 on adjacent side plates 110 are detachably inserted into the first limiting hole 311 and the second limiting hole 321, respectively. The walls of the first limiting hole 311 and the second limiting hole 321 abut against the side of the limiting portion 111, so that adjacent side plates 110 are tightly connected. Specifically, the limiting portion 111 can be formed by cutting a transverse groove at one end of the precast slab, such as... Figure 5 As shown, the cross-sections of the first limiting hole 311 and the second limiting hole 321 can be rectangular or trapezoidal. The limiting part 111 is inserted into the first limiting hole 311 and the second limiting hole 321. The hole walls of the first limiting hole 311 and the second limiting hole 321 abut against the side of the limiting part 111 to restrict the movement of the limiting part 111 in the horizontal direction, thereby restricting the relative displacement of the two side plates 110 in the horizontal direction to ensure the dimensional accuracy of the first mold cavity 120.

[0062] Reference Figure 1 In some embodiments, the formwork structure further includes a ground beam formwork 700, which is connected to the side of the foundation formwork 100. The ground beam formwork 700 has a second mold cavity 710, which is connected to the first mold cavity 120. The ground beam formwork 700 is used for pouring concrete foundation ground beams.

[0063] In some embodiments, along the vertical direction, one end of the side plate 110 has a groove and the other end has a protrusion. In two adjacent side plates 110 in the vertical direction, the protrusion of one side plate 110 can be detachably inserted into the groove of the other side plate 110, which facilitates the construction of the base mold 100.

[0064] Reference Figure 6 , Figure 6 The attached diagram shows the third connector, connecting device, and side plate. The dashed lines in the diagram are assembly guide lines to facilitate the explanation of the structure. In some embodiments, the concrete foundation formwork also includes a third connector 400. The third connector 400 is used to fix the bottom of the bottommost side plate 110 of the foundation formwork 100. The third connector 400 includes a first abutment 410, a second abutment 420, and a third abutment 430. The side plate 110 includes a first surface 112 and a second surface 113 arranged opposite to each other, and a third surface 114 and a fourth surface 115 arranged opposite to each other. The fourth surface 115 of one of the two adjacent side plates 110 abuts against the first abutment 410, and the first surface 112 abuts against the second abutment 420. The third surface 114 of the other side plate 110 abuts against the second abutment 420, and the first surface 112 abuts against the third abutment 430. Each side plate 110 has a first surface 112 defining a first mold cavity 120 for forming a concrete foundation, and a second surface 113 facing the soil. During assembly, only the fourth surface 115 of one side plate 110 needs to be held against the first supporting portion 410, and its first surface 112 against the second supporting portion 420. The third surface 114 of the other side plate 110 is held against the second supporting portion 420, and its first surface 112 against the third supporting portion 430. This restricts the two side plates 110 from moving towards the interior of the first mold cavity 120 under the pressure of backfill soil.

[0065] Reference Figure 6 In some embodiments, the mold structure further includes a connecting device 800, and the fourth surface 115 of the side plate 110 is provided with a mounting hole 117, and the first supporting part 410 is provided with a first through hole 411. The connecting device 800 includes an expansion screw 810, an expansion pin 820, and a locking nut 830. The expansion pin 820 is provided with a second through hole 821. The expansion screw 810 passes through the first through hole 411 and the second through hole 821 and is connected to the locking nut 830. The expansion pin 820 is engaged in the mounting hole 117. During the assembly process, the expansion screw 810 is first connected to the expansion pin 820 and the third connecting member 400. Then, the expansion pin 820 is placed in the mounting hole 117, and the locking nut 830 is tightened, causing the expansion pin 820 to expand and engage in the mounting hole 117, thereby fixing the third connecting member 400 to one of the two adjacent side plates 110 and preventing the third connecting member 400 from detaching.

[0066] Reference Figure 1 In some embodiments, corner shims 600 are provided at the joints of the side plates 110, and center shims 500 are provided at the joints of the plates 116. For example, when connecting the two plates 116 to the H-beam, center shims 500 are placed on both sides of the H-beam to ensure that the plates 116 on both sides of the H-beam are in the same horizontal direction. For example, when the two side plates 110 are connected at a certain angle, the corner shims 600 are placed at the lower end of the corners of the two side plates 110 to make the two side plates 110 horizontal.

[0067] Reference Figure 7 The second aspect of the present invention provides a method for constructing a mold, used to build the mold structure of the first aspect embodiment, comprising the following steps:

[0068] S100, excavation of the foundation pit;

[0069] S200, a foundation formwork 100 is set at the bottom of the pit;

[0070] S300, set anchor assembly 200;

[0071] S400, backfill soil outside the first mold cavity 120;

[0072] S500, the adjusting member 232 in the movable anchor assembly 200 is moved to adjust the position of the side plate 110.

[0073] Specifically, after the foundation pit is excavated, under safe conditions, the foundation formwork 100 is constructed simultaneously with the excavation. The foundation formwork 100 can be constructed by splicing multiple side panels 110, which can be made of common precast panels. Furthermore, the precast panels can be rectangular slabs with a protrusion on one side and a groove on the other. Vertically, adjacent side panels 110 are connected by inserting the protrusion of one side panel 110 into the groove of another side panel 110. Horizontally, adjacent side panels 110 are detachably connected via a second connector 300 and a third connector 400. After the foundation formwork 100 is constructed, anchor components 200 are connected to the outer wall of the first cavity 120 of the foundation formwork 100, i.e., the outer surface of the side panels 110. One end of the anchor component 200 is connected to the side panel 110, and the other end is connected to the foundation pit. Finally, the outside of the first cavity 120 is backfilled with soil and compacted. During the backfilling process, the tensioner 210 can apply tension to the side plate 110 to resist the lateral pressure exerted on the side plate 110 by the backfilled soil, prevent the side plate 110 from deforming and displacing, thereby causing the size of the first mold cavity 120 to change, so as to ensure the dimensional accuracy of the concrete foundation.

[0074] Step S300: Prepare the column 220. Insert the lower end of the column 220 into the undisturbed soil at the bottom of the pit. The column 220 can be made of H-steel, with the flange of the H-steel forming an installation groove 222. The side plate 110 is divided into multiple plates 116. Insert the plates 116 into the installation grooves 222 to connect the plates 116 to the H-steel. During the construction process, first insert the column 220 into the undisturbed soil of the pit at the designated position, and then insert the plates 116 into the installation grooves 222. The adjustment device 230 is installed in the adjustment groove 221 at the upper end of the column 220. The adjustment device 230 includes a first connecting member 231 and an adjusting member 232. A through connecting hole is provided on the side wall of the adjustment groove 221. During installation, the first connecting member 231 can be a screw, and the adjusting member 232 can be a nut. During installation, first, the first connector 231 is passed through the first connector 231 on one side wall, then the adjusting member 232 is fitted onto the first connector 231, and finally the first connector 231 is connected to the connecting hole on the other side wall of the adjusting groove 221. One end of the tensioning member 210 is connected to the adjusting member 232, and the other end is fixed to the bottom of the pit.

[0075] In step S500, when the adjusting member 232 is moved, the adjusting member 232 can move relative to the column 220. Since one end of the tensioning member 210 is connected to the adjusting member 232 and the other end is fixed to the bottom of the pit, when the adjusting member 232 is moved towards the first mold cavity 120, the upper end of the column 220 can shift outwards from the first mold cavity 120. At the same time, the side plate 110 can shift along with the column 220. This gives the anchor assembly 200 a certain position adjustment function for the side plate 110, and when necessary, the position and shape of the side plate 110 can be adjusted by the adjusting member 232.

[0076] In some embodiments, after backfilling soil outside the first mold cavity 120, the adjusting member 232 is moved to straighten the position of the side plate 110 to ensure the size of the first mold cavity 120, thereby ensuring the size of the concrete foundation after concrete pouring and improving safety.

[0077] In some embodiments, the method of connecting the tensioner 210 to the bottom of the pit includes the following steps:

[0078] A ground anchor 250 is connected to the end of the tensioner 210 away from the side plate 110;

[0079] Place the ground anchor 250 at the bottom of the pit.

[0080] Specifically, to shorten construction time, a ground anchor 250 is connected to the end of the tensioning member 210 that connects to the bottom of the pit. The ground anchor 250 has a large surface area facing upwards. During construction, the ground anchor 250 is placed at the bottom of the pit, and then soil is backfilled into the pit. The weight of the backfilled soil is used to press the ground anchor 250 tightly against the bottom of the pit.

[0081] The method for constructing a concrete foundation pit according to a third aspect of the present invention includes the following steps:

[0082] The tire mold structure is constructed based on the tire mold construction method of the second aspect embodiment;

[0083] An unreinforced concrete pad layer was poured at the bottom of the first mold cavity 120;

[0084] Reinforcing bars are installed inside the first mold cavity 120;

[0085] Concrete is poured into the first mold cavity 120.

[0086] Specifically, the formwork structure constructed using the formwork construction method of the second embodiment allows for higher dimensional accuracy of the first mold cavity 120, resulting in higher precision of the poured concrete foundation and enhanced safety. Furthermore, in traditional construction processes, an unreinforced concrete pad layer needs to be poured at the bottom of the pit before the formwork structure is constructed to seal the first mold cavity 120 and ensure its levelness. Therefore, in traditional methods, the unreinforced concrete pad layer must reach a certain strength before the formwork structure can be constructed. However, in this embodiment, the formwork structure is leveled using a center pad 500 and corner pads 600 during construction. The unreinforced concrete pad layer is poured only after the formwork structure is completed. This allows for simultaneous excavation of the foundation pit and construction of the formwork structure, enabling backfilling after construction and shortening the pit's exposure time, thus reducing the risk of pit collapse.

[0087] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A formwork structure for pouring concrete foundations in foundation pits, characterized in that: include: A base mold, the base mold including side plates, the side plates including multiple plates connected in sequence, the side plates enclosing to form a first mold cavity, the first mold cavity being used for concrete foundation pouring; An anchor assembly includes a tensioning member, a column, and an adjusting device. The column is connected between adjacent plates of each side plate. The lower end of the column can be inserted into the bottom of the pit. The upper end of the column is also provided with an adjusting groove. The two side walls of the adjusting groove have connecting holes. The adjusting device includes a first connecting member and an adjusting member. The first connecting member is connected to the adjusting groove through the connecting holes. The adjusting member is connected to the first connecting member and can move relative to the first connecting member toward the first mold cavity. One end of the tensioning member is connected to the adjusting member, and the other end is connected to the bottom of the pit and located outside the first mold cavity. When the adjusting member moves, the side plate can shift away from the first mold cavity. The column is made of H-steel. The flange of the H-steel defines two mounting grooves facing opposite directions. The ends of two adjacent plates facing opposite directions in the horizontal direction are respectively inserted into the two mounting grooves facing opposite directions. The second connector includes a first connecting portion and a second connecting portion. The first connecting portion has a first limiting hole, and the second connecting portion has a second limiting hole. The side plate is provided with a limiting portion. The limiting portions on adjacent side plates are detachably inserted into the first limiting hole and the second limiting hole, respectively. The hole walls of the first limiting hole and the second limiting hole abut against the side of the limiting portion so that the adjacent side plates are tightly connected.

2. The tire mold structure according to claim 1, characterized in that, The anchor assembly also includes a support member, one end of which abuts against the bottom of the pit and the other end of which abuts against the side of the tensioning member.

3. The tire mold structure according to claim 1, characterized in that, The anchor assembly also includes a ground anchor, the tensioning member is connected to the ground anchor, and the backfill soil of the pit can press against the ground anchor, so that the ground anchor is tightly attached to the bottom of the pit.

4. The tire mold structure according to claim 1, characterized in that, The base mold includes multiple side plates, and the ends of each side plate are detachably connected.

5. A method for constructing a formwork structure, used to build any one of claims 1 to 4, characterized in that, Includes the following steps: Excavation of the foundation pit; The foundation mold is set at the bottom of the foundation pit; Set the anchor assembly; Backfill the outside of the first mold cavity with soil; Move the adjusting member in the anchor assembly to adjust the position of the side plate.

6. A method for constructing a concrete foundation for an excavation pit, characterized in that, Includes the following steps: The mold structure was constructed based on the mold construction method described in claim 5. A layer of unreinforced concrete is poured at the bottom of the first mold cavity to seal it; reinforcing bars are installed inside the first mold cavity. Concrete is poured into the first mold cavity.

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