A construction method using filled concrete as a structure side mold

Abstract

The present application relates to the field of building construction technology, and provides a construction method using filled concrete as a side form of a structure, comprising: overall excavation of foundation pits corresponding to high-position structures and low-position structures to form high-position bases and low-position bases with height differences; pouring a cushion layer on the high-position bases and pouring a concrete filling body in the height difference region between the foundation pits of the high-position structures and the foundation pits of the low-position structures; erecting a vertical blocking formwork on the filling region towards the low-position structures before pouring the filling body; after the cushion layer and the concrete filling body solidify and form, removing the vertical blocking formwork, completing the main body pouring construction of the high-position structures; and using the exposed side wall of the solidified concrete filling body as a permanent side form of the low-position structures towards the high-position structures. The present application uses a filling body as a cushion layer to solve the problem of high-position foundation construction first, and uses the filling body as a side form of an adjacent low-position foundation to solve the operation problem of template installation and removal in a narrow space.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a construction method that uses infill concrete as the side formwork of a structure. Background Technology

[0002] Industrial building foundations and equipment foundations are often close together but at different depths. Construction typically follows a "lower to higher" principle: the foundation with the lower elevation is built first, then backfilled, and finally the adjacent foundation with the higher elevation is constructed. Because the later-constructed foundation is located above the backfill soil, its density is lower than the original soil and does not meet the original soil's bearing capacity standards. Therefore, low-grade concrete is usually used to fill the gap before constructing the higher foundation.

[0003] However, under certain special conditions, it is necessary to construct the foundation with a higher bottom elevation first. For example, the drainage ditches and sump pits of underground space structures require the foundation with a higher bottom elevation to be completed first due to design schedule constraints.

[0004] Therefore, it is necessary to provide a construction method that uses filled concrete as the side formwork of the structure to ensure the stability of the foundation pit, and to ensure that the construction process is simple and reliable. Summary of the Invention

[0005] This invention provides a construction method that uses infill concrete as the side formwork of a structure, which solves the problem of the inability to construct the foundation with a higher bottom elevation in the prior art. It realizes the use of infill as the side formwork of the adjacent low-level foundation, which not only solves the operational difficulties of formwork installation and removal in narrow spaces, but also reduces the workload of formwork construction.

[0006] This invention provides a construction method using filled concrete as side formwork for structures, for the simultaneous construction of foundation pits for adjacent high-level and low-level structures, comprising the following steps: S1. Excavate the foundation pits corresponding to the high-level structures and low-level structures in a sloping manner to form the foundation pit slope. After the excavation is completed, a high-level foundation and a low-level foundation with a height difference are formed. S2. A cushion layer is poured on the high-level base, and a concrete filler is poured in the area of ​​the height difference between the foundation pit of the high-level structure and the foundation pit of the low-level structure. The concrete filler is integrated with the cushion layer. Before pouring the concrete filler, a vertical sealing template is erected on the side of the filling area facing the low-level structure so that the surface of the vertical sealing template adjacent to the concrete filler is aligned with the design outline of the outer wall of the low-level structure. S3. After the foundation layer and the concrete filler have solidified, remove the vertical sealing formwork to complete the main pouring construction of the high-level structure. S4. Using the exposed sidewall of the solidified concrete filler as a permanent side formwork for the side of the low-level structure facing the high-level structure, pour concrete into the cavity of the low-level structure formwork to complete the construction of the low-level structure.

[0007] According to the construction method of the present invention using infill concrete as side formwork for a structure, after step S1 is completed and before step S2, the method further includes the following step: Temporary reinforcement is provided in the cushion layer and the filling body to achieve overall tie reinforcement; threaded tie rods that extend through to the outer wall of the side facing the lower structure are pre-embedded in the filling body.

[0008] According to a construction method of the present invention, which uses filled concrete as the side formwork of a structure, the threaded tie rod is used to connect and fix the inner formwork of the low-level structure.

[0009] According to a construction method for using infill concrete as a side formwork of a structure provided by the present invention, the temporary reinforcement includes temporary bottom reinforcement laid along the bottom slope of the infill body and temporary top reinforcement laid on the top surface of the infill body; one end of the temporary bottom reinforcement is embedded in the bottom of the slope of the infill body, and the other end extends and is anchored to the cushion layer of the elevated structure.

[0010] According to the present invention, a construction method using infill concrete as the side formwork of a structure is provided, wherein the temporary reinforcement is made of round steel with a diameter of Φ8 to Φ10, and the spacing between adjacent temporary reinforcements is 300 to 500 mm.

[0011] According to a construction method of the present invention using filled concrete as the side formwork of a structure, a tightening device is installed on the exposed outer end of the threaded tie rod, and the tightening device is locked in place with the internal formwork of the lower structure.

[0012] According to the present invention, a construction method using infilled concrete as the side formwork of a structure is provided, wherein the lower structure is a sump pit or an underground drainage ditch / pool, and the higher structure is a factory / equipment foundation.

[0013] According to a construction method of the present invention that uses filled concrete as the side formwork of a structure, in step S1, the side wall of the foundation pit is sloped according to the on-site soil parameters during the excavation of the foundation pit to form the foundation pit slope.

[0014] According to the present invention, a construction method using infill concrete as a side formwork for a structure is provided, wherein the infill concrete is cast using low-grade concrete.

[0015] This invention provides a construction method using infill concrete as a side formwork for structures, used for the simultaneous construction of foundation pits for adjacent high-level and low-level structures. The method involves excavating the foundation pits corresponding to the high-level and low-level structures with an overall slope, forming a high-level foundation and a low-level foundation with a height difference. A cushion layer is poured on the high-level foundation, and a concrete filler is poured in the area of ​​the height difference between the foundation pits of the high-level and low-level structures, with the concrete filler integrated with the cushion layer. This method solves the problem of constructing the high-level foundation first. Before pouring the filling material, a vertical sealing formwork is erected on the side of the filling area facing the lower structure, so that the surface of the vertical sealing formwork adjacent to the concrete filling material is aligned with the design outline of the outer wall of the lower structure. After the subbase and the concrete filling material have solidified, the vertical sealing formwork is removed, and the main pouring construction of the upper structure is completed. The exposed side wall of the solidified concrete filling material is used as the permanent side formwork on the side of the lower structure facing the upper structure. Concrete is poured into the cavity of the lower structure formwork to complete the construction of the lower structure. This not only solves the operational difficulties of installing and removing formwork in a narrow space, but also reduces the workload of formwork construction. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic flowchart of the construction method for using filled concrete as the side formwork of a structure provided by the present invention. Figure 2 This is one of the schematic diagrams of the construction process of adjacent high and low foundations provided by the present invention; Figure 3 This is the second schematic diagram of the construction process of adjacent high and low foundations provided by the present invention.

[0018] Figure label: 1. Subbase; 2. Concrete filler; 3. Excavation pit slope; 4. Temporary bottom reinforcement; 5. Temporary top reinforcement; 6. Tightening tie rods; 7. Internal formwork. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0020] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present 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 limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] The following is combined Figures 1-3 The present invention describes an embodiment of a construction method that uses filled concrete as a side formwork for a structure, including simultaneous foundation pit construction for adjacent high-level and low-level structures, comprising the following steps.

[0022] S1. The foundation pits corresponding to the high-level and low-level structures are sloped as a whole to form foundation pit slope 3, thus forming a high-level base and a low-level base with a height difference.

[0023] In the above steps, the slope excavation of the foundation pit sidewall is carried out according to the soil bearing capacity and slope stability parameters at the construction site. The high-level foundation and the low-level foundation are excavated simultaneously, without the need for batches, thus shortening the foundation pit excavation period.

[0024] S2. Pour foundation pad 1 on the excavated high-level base. Pour low-grade concrete filler 2 in the triangular area of ​​the height difference between the high-level foundation pit and the low-level sump pit, so that the concrete filler 2 and the high-level foundation pad 1 are solidified into an integral structure after pouring. Before pouring the filler, erect a vertical sealing template on the side of the filler facing the low-level sump pit. Adjust the position of the vertical sealing template so that the side of the vertical sealing template that fits the concrete filler 2 coincides with the design outline of the outer wall of the low-level sump pit.

[0025] In the above steps, the high-level cushion layer 1 and the filling material are cast together to form an integral load-bearing structure, which can resist the risk of slippage and overturning of the filling material under later loads. This is suitable for the special working condition of high-level foundation construction first, breaking the traditional construction procedure of low-level first and high-level later. The vertical sealing template is aligned with the outline of the outer wall of the low-level structure. The size and flatness of the outer wall of the filling material after casting are completely matched with the requirements of pool wall forming, without the need for secondary repair.

[0026] S3. After the foundation layer 1 and concrete filler 2 have cured and solidified to the design strength, remove the vertical sealing formwork on the side of the filler and complete the overall concrete pouring construction of the high-level factory equipment foundation based on the formed foundation layer 1.

[0027] S4. After removing the vertical sealing formwork, the concrete filler 2 forms a smooth and flat exposed sidewall facing the low-level sump. The exposed sidewall is used directly as the permanent side formwork facing the factory foundation of the low-level sump. The inner formwork of the sump is erected to form a closed pouring cavity. Concrete is poured into the formwork cavity to complete the overall construction of the low-level sump.

[0028] In the above steps, the solidified concrete filler 2 is directly used as the single-sided permanent side formwork of the low-level structure. There is no need to separately erect or dismantle the outer steel / wooden formwork in the narrow foundation pit gap, which saves the formwork dismantling and assembly process in narrow spaces, reduces the consumption of formwork materials, and simplifies the construction process.

[0029] In a specific embodiment of the present invention, after step S1 is completed and before step S2 is poured, a supporting pretreatment construction procedure is added. Before the pouring of the foundation layer 1 and the concrete filler 2, temporary reinforcement is pre-installed to tie the foundation layer 1 and the concrete filler 2 into a whole.

[0030] More specifically, temporary reinforcement is added to the foundation layer 1 and the infill to eliminate the potential for cracking and separation at the interface between the infill and the foundation layer 1, prevent the infill from sliding laterally under the load from the upper part, and ensure the structural stability of the foundation pit and the structure throughout the construction process.

[0031] Meanwhile, multiple threaded tie rods are pre-embedded in the concrete infill body 2. One end of each threaded tie rod is pre-embedded and fixed inside the infill body, and the other end extends through to the exposed side wall of the infill body facing the lower structure.

[0032] In the above embodiments, the pre-embedded through-threaded tie rod can be directly used to fix the inner template of the low-level structure, without the need for secondary drilling and rebar installation on the molded filling body, thus avoiding damage to the integrity of the filling body structure and simplifying the pool wall template fixing operation.

[0033] In a specific embodiment of the present invention, after the inner template of the low-level structure is erected, the exposed end of the threaded tie rod embedded in the filling body is connected and fixed to the inner template of the low-level structure, and the threaded tie rod forms a limiting constraint on the inner template.

[0034] In the above embodiments, the threaded tie rod is simultaneously anchored between the concrete filler 2 and the inner template. When the lateral pressure is generated during the pouring of the pool wall concrete, the inner template can be constrained in both directions to prevent the template from bulging or shifting inward, thus ensuring the dimensional accuracy of the pool wall forming of the low-level structure.

[0035] In a specific embodiment of the present invention, the temporary reinforcement includes a temporary bottom reinforcement 4 and a temporary top reinforcement 5. The temporary bottom reinforcement 4 is laid along the entire length of the inclined slope at the bottom of the concrete filler 2, and the temporary top reinforcement 5 is laid flat on the top surface of the concrete filler 2. In the above embodiments, the temporary surface reinforcement 5 arranged on the top surface restrains the cracking and bulging of the top surface of the infill, and forms a double-layer tie net with the bottom reinforcement to improve the overall rigidity of the infill and prevent the infill from cracking and deforming under the action of pouring and load.

[0036] The lower end of each temporary bottom reinforcement bar 4 is embedded in the bottom of the slope of the filling body, and the upper end extends upward along the slope and is horizontally anchored to the interior of the high-level structure cushion layer 1. The bottom reinforcement bar and the top reinforcement bar work together to form a complete tie skeleton.

[0037] In the above embodiments, the bottom reinforcement obliquely penetrates the infill and is anchored into the pad layer 1, which can counteract the shear force of the infill sliding along the slope of the base towards the lower structure, and constrain the displacement of the infill from the bottom.

[0038] In a specific embodiment of the present invention, the temporary bottom reinforcement 4 and the temporary top reinforcement 5 are uniformly made of ordinary round steel with a diameter of Φ8 to Φ10.

[0039] In the above embodiments, Φ8~Φ10 round steel is inexpensive and easy to process on site, meeting the temporary tie-up stress requirements, eliminating the need for high-strength main reinforcement, and reducing the construction cost of temporary reinforcement.

[0040] In a specific embodiment of the present invention, the spacing between two adjacent temporary bottom reinforcing bars 4 and two adjacent temporary top reinforcing bars 5 along the length direction of the filling body is controlled to be 300-500mm.

[0041] In the above embodiments, the spacing of 300-500mm is uniform, which takes into account both the tying effect and the amount of steel reinforcement. Too small a spacing will cause material waste, while too large a spacing will result in insufficient local tying strength and easy local deformation of the filling. This range of parameters is suitable for most industrial foundation pit soil conditions.

[0042] In a specific embodiment of the present invention, a tightening device is installed at the end of each threaded tie rod that extends out of the exposed side wall of the filling body. After the inner template of the low-level structure is erected, the tightening device is locked and fitted with the back support structure of the inner template. The template is pre-fixed by tightening the threaded tie rod through the tightening device.

[0043] In the above embodiments, the tightening device can adjust the tension of the threaded tie rod, which can control the pouring gap between the inner template and the outer wall of the concrete filler 2, ensuring that the concrete thickness of the pool wall is uniform; at the same time, it is easy to install and remove, and the inner template can be quickly loosened after the concrete curing is completed, thus improving the demolding efficiency.

[0044] In a specific embodiment of the present invention, the low-level structures within the construction system are selected as underground drainage ditches or sump pits, and the high-level structures are selected as industrial plant equipment foundations, which is suitable for scenarios where adjacent equipment foundations and underground drainage structures are constructed simultaneously in metallurgical and mining plant areas.

[0045] It should be noted that the most typical working conditions for this invention are the large load on the foundations of factory buildings and equipment, the high priority of construction progress, the deeper sump pits or drainage ditches, and the narrow gaps between foundation pits. This invention can perfectly solve the industry pain points of high-level foundation construction and the difficulty of disassembling and assembling formwork in narrow gaps, and has strong versatility in the construction of mining and metallurgical industrial plants.

[0046] In a specific embodiment of the present invention, during the synchronous excavation of the foundation pit of the high and low structure in step S1, the slope of the foundation pit 3 is designed in a targeted manner based on soil parameters such as soil layer type, groundwater level, and foundation pit excavation depth at the construction site, and the foundation pit sidewall is excavated in layers to form a stable foundation pit slope 3.

[0047] In the above embodiments, slopes are laid according to the differences in soil conditions on site to avoid slope collapse and soil slippage caused by uniform slopes. The stability of the foundation pit sidewalls is ensured throughout the synchronous excavation process, eliminating the need for additional large-area foundation pit support and saving foundation pit support construction costs.

[0048] In a specific embodiment of the present invention, the concrete filling body 2 of the height difference area is cast in one piece using low-grade concrete.

[0049] The infill material serves only as a lateral formwork and auxiliary load-bearing structure for the foundation layer 1, and does not need to bear the vertical load of large equipment. The strength of low-grade concrete can meet the requirements for stiffness and forming, which greatly reduces the cost of concrete raw materials. On the one hand, the low-grade concrete has a low cement content and low heat of hydration, resulting in less shrinkage and deformation of the infill material after pouring, ensuring the smoothness of the outer wall of the infill material and avoiding leakage of grout due to shrinkage cracks. On the other hand, if the infill material needs to be removed due to renovation later, the low-grade concrete is easier to remove, which facilitates the later site renovation construction.

[0050] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "method," "specific method," or "some methods," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or method is included in at least one embodiment or method of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or method. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or methods. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or methods described in this specification, as well as the features of different embodiments or methods.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method using infill concrete as side formwork for a structure, used for the simultaneous construction of foundation pits for adjacent high-level and low-level structures, characterized in that... Including the following steps: S1. The foundation pits corresponding to the high-level structures and low-level structures are sloped as a whole to form the foundation pit slope (3). After the excavation is completed, a high-level base and a low-level base with a height difference are formed. S2. A cushion layer (1) is poured on the high-level base. A concrete filler (2) is poured in the area of ​​the height difference between the foundation pit of the high-level structure and the foundation pit of the low-level structure. The concrete filler (2) is integrated with the cushion layer (1). Before pouring the concrete filler (2), a vertical sealing template is erected on the side of the filling area facing the low-level structure so that the surface of the vertical sealing template adjacent to the concrete filler (2) is aligned with the design outline of the outer wall of the low-level structure. S3. After the cushion layer (1) and the concrete filler (2) have solidified and formed, the vertical sealing template is removed to complete the main pouring construction of the high-level structure. S4. Using the exposed sidewall of the solidified concrete filler (2) as the permanent side formwork of the low-level structure facing the high-level structure, pour concrete into the cavity of the low-level structure formwork to complete the construction of the low-level structure.

2. The construction method using infill concrete as the side formwork of a structure according to claim 1, characterized in that, After step S1 is completed and before step S2, the following steps are also included: Temporary reinforcement is provided in the cushion layer (1) and the filling body to achieve overall tie reinforcement; a tightening rod (6) is pre-embedded in the filling body to the outer wall facing the lower structure.

3. The construction method using infill concrete as the side formwork of a structure according to claim 2, characterized in that, The tightening rod (6) is used to connect and fix the inner template of the low-level structure.

4. The construction method using infill concrete as the side formwork of a structure according to claim 2, characterized in that, The temporary reinforcement includes a temporary bottom reinforcement (4) laid along the bottom slope of the infill body and a temporary top reinforcement (5) laid on the top surface of the infill body; one end of the temporary bottom reinforcement (4) is buried in the bottom slope of the infill body, and the other end extends and is anchored to the inside of the cushion layer (1) of the high-level structure.

5. The construction method using infill concrete as the side formwork of a structure according to claim 4, characterized in that, The temporary reinforcement uses round steel with a diameter of Φ8 to Φ10, and the spacing between adjacent temporary reinforcements is 300 to 500 mm.

6. The construction method using infill concrete as the side formwork of a structure according to claim 2, characterized in that, The outer exposed end of the tightening rod (6) is equipped with a tightening device, which is locked in place with the internal template (7) of the low-level structure.

7. The construction method using infill concrete as the side formwork of a structure according to claim 1, characterized in that, The low-level structures are sump pits or underground drainage ditches and pools, while the high-level structures are the foundations of factory buildings and equipment.

8. The construction method using infill concrete as the side formwork of a structure according to claim 1, characterized in that, In step S1, the foundation pit sidewalls are sloped according to the on-site soil parameters during excavation to form the foundation pit slope (3).

9. The construction method using infill concrete as the side formwork of a structure according to claim 1, characterized in that, The concrete filler (2) is formed by casting low-grade concrete.

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