Foundation pit formwork structure based on steel sheet piles

Abstract

The utility model provides a foundation pit formwork structure based on steel sheet piles, which comprises an outer formwork and an inner formwork, the outer formwork is fixed in a foundation pit through a steel sheet pile wall, the steel sheet pile wall comprises a positive trapezoidal steel sheet pile and a negative trapezoidal steel sheet pile which are sequentially connected, and vertical sleeves are uniformly welded on the center line of the positive trapezoidal steel sheet pile; connecting rods in one-to-one correspondence with the sleeves are arranged on the outer formwork, each connecting rod comprises a transverse pipe and a vertical pipe vertically connected to one end of the transverse pipe, the other end of the transverse pipe is vertically arranged on the outer formwork, and the vertical pipes face upwards; the steel sheet pile wall is fixed to the edge of the bottom of the foundation pit, the outer formwork is vertically placed at the bottom of the foundation pit and is parallel to the steel sheet pile wall, and the vertical pipes are arranged in the corresponding sleeves in a penetrating mode. The outer formwork is fixed and supported through the steel sheet piles, the narrow foundation pit edge space can be used for fixing the outer formwork, and the fixing space of the outer formwork is saved.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support technology, and more specifically, to a foundation pit support structure based on steel sheet piles. Background Technology

[0002] With the continuous upgrading of processes and equipment in the metallurgical industry, the space for modifying existing production lines is limited, making foundation pit construction difficult. Deep foundation pit construction often involves complex surrounding environments, limited space, and lack of conditions for slope excavation. In foundation pit support, when space is limited, there is insufficient operating space for workers to support and fix the outer formwork, making it difficult to stably set up the outer formwork, thus hindering foundation pit formwork (formwork installation) construction. Utility Model Content

[0003] In view of the above problems, the purpose of this utility model is to provide a foundation pit formwork structure based on steel sheet piles. The steel sheet piles are used to fix and support the outer formwork, which can be fixed in the narrow space at the edge of the foundation pit, saving the fixing space of the outer formwork, making the fixing firm and labor-saving, and improving the formwork support efficiency.

[0004] This utility model provides a foundation pit formwork structure based on steel sheet piles, including an outer formwork and an inner formwork. The outer formwork is fixed inside the foundation pit by a steel sheet pile wall.

[0005] The sheet pile wall includes trapezoidal sheet piles connected in a positive and negative sequence, with vertical sleeves uniformly welded along the centerline of the positively connected trapezoidal sheet piles.

[0006] The outer template is provided with connecting rods that correspond one-to-one with the sleeves. The connecting rods include a horizontal tube and a vertical tube that is vertically connected to one end of the horizontal tube. The other end of the horizontal tube is vertically arranged on the outer template, and the vertical tube faces upward.

[0007] The sheet pile wall is fixed to the bottom edge of the foundation pit, the outer formwork is placed vertically on the bottom of the foundation pit and parallel to the sheet pile wall, and the vertical pipe is inserted into the corresponding sleeve.

[0008] The inner template is disposed on the side of the outer template facing the foundation pit and has a set distance from the outer template.

[0009] A support block is provided between the left and right adjacent connecting rods, and the support block is fixed to the side of the outer template facing the steel sheet pile wall. The support block is supported between the outer template and the trapezoidal steel sheet pile of the reverse connection.

[0010] The thickness of the support block is 10cm.

[0011] The outer template has through holes corresponding to the sleeves. Nuts are provided on the side of the through holes facing the inside of the pit. Threads are provided at the end of the horizontal tube. The horizontal tube passes through the through holes and is screwed to the nuts through the threads.

[0012] The distance between adjacent sleeves is 50cm.

[0013] Coarse sand is filled between the sheet pile wall and the outer formwork.

[0014] The set spacing is the thickness of the support wall.

[0015] Reinforcing bars are tied between the inner formwork and the outer formwork.

[0016] The inner formwork and the outer formwork are installed on two opposite inner walls of the foundation pit, and the two opposite inner formworks are supported by full-span scaffolding.

[0017] U-shaped top members are provided at both ends of the horizontal tube of the full-span scaffold. The U-shaped top member includes a middle plate, side plates respectively provided at both ends of the middle plate, and a screw rod provided in the middle of the side of the middle plate away from the side plates. A flat nut is screwed on the screw rod. The screw rod is inserted into the horizontal tube. The flat nut is blocked at the port of the horizontal tube. The end of the side plate abuts against the inner template.

[0018] As described above, the sheet pile-based foundation pit formwork structure provided by this utility model connects the outer formwork of the retaining wall to the sheet piles via a connecting rod with one end bent upwards. The outer formwork is set along the bottom edge of the foundation pit by the support of the sheet pile wall, occupying only a small amount of formwork space, and the sheet pile wall is easy to dismantle later. This utility model saves the fixing space of the outer formwork, is firmly fixed and labor-saving, solves the problem of complex conditions around the foundation pit that make it impossible to support the outer side of the formwork, improves the formwork efficiency, brings the retaining wall closer to the edge of the foundation pit, increases the utilization of the space inside the foundation pit, and solves the problem of deep foundation pit sheet pile support when the working surface cannot be guaranteed, allowing the sheet piles to be easily extracted after the underground structure construction is completed. Attached Figure Description

[0019] Other objects and results of this invention will become more apparent and readily understood upon referring to the following description taken in conjunction with the accompanying drawings, and with a more complete understanding of the invention. In the drawings:

[0020] Figure 1 This is a top view of a foundation pit formwork structure based on sheet piles according to an embodiment of the present invention;

[0021] Figure 2 This is a vertical sectional view of a foundation pit formwork structure based on sheet piles according to an embodiment of the present utility model;

[0022] Figure 3 for Figure 2 Enlarged view of A in the middle;

[0023] Among them, 1-outer formwork, 2-inner formwork, 3-steel sheet pile wall, 4-trapezoidal steel sheet pile, 5-sleeve, 6-connecting rod, 61-horizontal pipe, 62-vertical pipe, 63-thread, 7-support block, 8-through hole, 9-nut, 10-coarse sand, 11-full-span scaffolding, 12-U-shaped top piece, 121-middle plate, 122-side plate, 123-screw rod, 124-flat nut, 13-foundation pit;

[0024] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation

[0025] This invention can be modified in various ways and has various embodiments, with specific embodiments illustrated in the accompanying drawings. However, this invention is not limited to this specific implementation and all modifications, equivalents, and substitutions falling within the spirit and technical scope of this invention are to be understood as included.

[0026] Ordinal terms such as "first," "second," etc., may be used to describe various constituent elements, but the constituent elements are not limited to these terms. The terms are used only to distinguish one constituent element from another. For example, without departing from the scope of the claims of this utility model, a second constituent element may be named a first constituent element, and similarly, a first constituent element may be named a second constituent element. Terms and / or include combinations of multiple associated items or one of multiple associated items.

[0027] It should be understood that when referring to a constituent element being "connected" or "in contact" with other constituent elements, this includes not only cases where it is directly connected or in contact with other constituent elements, but also cases where other constituent elements exist between them. Conversely, when referring to a constituent element being "directly connected" or "directly in contact" with other constituent elements, it should be understood that no other constituent elements exist between them.

[0028] In the description of the embodiments, when it is stated that a certain component is formed "on or under" other components, "on or under" includes both two components that are in direct contact with each other and at least one other component that is configured to be formed between the two components. Furthermore, when expressed as "on or under", based on a certain component, it refers not only to the upper direction but may also include the lower direction.

[0029] The terminology used in this application is for illustrative purposes only and is not intended to limit the scope of the invention. Unless the context clearly specifies otherwise, singular expressions include plural expressions. In this application, terms such as "comprising" or "having" are used to specify the presence of features, numbers, steps, operations, constituent elements, components, or combinations thereof described in the specification, and do not preclude the presence or additional possibilities of one or more other features, numbers, steps, operations, constituent elements, components, or combinations thereof.

[0030] Unless otherwise defined, including technical or scientific terms, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Terms as defined in commonly used dictionaries should be interpreted in a meaning consistent with their meaning in the context of the relevant art, and should not be construed as having an ideal or overly formal meaning unless explicitly defined in this application.

[0031] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0032] Figure 1 This is a top view of a foundation pit formwork structure based on sheet piles according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a foundation pit formwork structure based on sheet piles according to an embodiment of the present utility model; Figure 3 for Figure 2 A magnified view of A in the middle.

[0033] like Figures 1-3 As shown in the figure, the foundation pit formwork structure based on steel sheet piles proposed in this embodiment can be used for the installation of foundation pit support formwork, and can also be used for the support of other formwork near the wall.

[0034] The support of foundation pit 13 requires the installation of inner and outer formwork along the edge of foundation pit 13, followed by the pouring of concrete into the inner and outer formwork. After the concrete solidifies, a retaining wall is formed. By using this foundation pit formwork structure based on steel sheet piles, the space occupied by the formwork on the outer side of the outer formwork 1 adjacent to the inner wall of foundation pit 13 can be saved, which is beneficial for formwork support at the edge of foundation pit 13 under unfavorable conditions.

[0035] This foundation pit formwork structure based on sheet piles includes an outer formwork 1 and an inner formwork 2. The outer formwork 1 is adjacent to the inner wall of the foundation pit 13 and has a gap between it and the inner wall. The gap is sufficient to connect the sheet pile wall 3. The inner formwork 2 is set on the side of the outer formwork 1 facing the foundation pit 13. The inner formwork 2 and the outer formwork 1 have a set gap, which is the thickness of the support wall to be poured.

[0036] The outer formwork 1 is fixed to the inner wall of the pit 13 by steel sheet pile wall 3. The outer formwork 1 and the inner formwork 2 are supported by conventional formwork support method. The inner formwork 2 is supported by full-span scaffolding 11 on the side facing the inside of the pit 13.

[0037] To firmly support the outer formwork 1, the sheet pile wall 3 is securely driven into the bottom edge of the foundation pit 13 using the Larssen sheet pile construction method. The sheet pile wall 3 uses trapezoidal cross-section sheet piles, with trapezoidal sheet piles 4 connected sequentially in opposite directions to form the sheet pile wall 3. Vertical sleeves 5 are evenly welded along the centerline of the positively connected trapezoidal sheet piles 4. The outer formwork 1 is positioned on the side of the sheet pile wall 3 facing the foundation pit 13. The middle plate of the negatively connected trapezoidal sheet piles 4 is closer to the outer formwork 1, while the middle plate of the positively connected trapezoidal sheet piles 4 is farther away. The sleeves 5 along the centerline of the positively connected trapezoidal sheet piles 4 ensure that the connecting rods 6 have sufficient length to connect with the outer formwork 1, thus pulling the entire sheet pile wall 3 together with the outer formwork 1.

[0038] On each positively connected trapezoidal steel sheet pile 4, a sleeve 5 is installed at regular intervals to ensure that the connection between the steel sheet pile wall 3 and the outer formwork 1 is uniform and stable.

[0039] In order to connect with the sheet pile wall 3, a connecting rod 6 corresponding to the sleeve 5 is set on the outer formwork 1. The connecting rod 6 includes a horizontal pipe 61 and a vertical pipe 62 vertically connected to one end of the horizontal pipe 61. The other end of the horizontal pipe 61 is vertically set on the outer formwork 1, and the vertical pipe 62 faces upward.

[0040] The connecting rods 6 are arranged in rows on the outer formwork 1, with each row corresponding to the centerline of the trapezoidal sheet piles 4 that are being connected. The spacing between the connecting rods 6 in each row is the same as the spacing between the sleeves 5. The connecting rods 6 are L-shaped, with the horizontal tubes 61 connected horizontally to the outer formwork 1 and the vertical tubes 62 being the bends of the connecting rods 6, pointing vertically upwards. The bends can be easily hooked into the vertical sleeves 5 from bottom to top, making it very convenient to pull out the sheet piles later.

[0041] The length of the horizontal pipe 61 is sufficient to separate the outer formwork 1 and the sheet pile wall 3, so that there is a certain gap between the trapezoidal sheet pile 4 and the outer formwork 1, which facilitates sand filling. The length of the vertical pipe 62 is sufficient to pass through the sleeve 5, and the length of the sleeve 5 can not exceed 10cm. The inner diameter of the sleeve 5 is compatible with the outer diameter of the vertical pipe 62.

[0042] During construction, on-site measurements and layout are conducted to mark the boundary lines of the retaining wall. Sheet pile wall 3 is constructed outside the outer boundary lines. The distance between the trapezoidal sheet piles 4 connecting to the outer edge lines of sheet pile wall 3 and the outer boundary lines should be approximately 10cm. The outer formwork 1 is placed vertically along the outer boundary lines at the bottom of the foundation pit 13, with the elbows inserted into the corresponding sleeves 5. The outer support of the outer formwork 1 is complete, and the outer formwork 1 is parallel to the sheet pile wall 3, ensuring a secure support. The spacing between the outer formwork 1 and the inner formwork 2 is set to the thickness of the retaining wall. Conventional formwork is used between the outer formwork 1 and the inner formwork 2. Reinforcing bars for concrete pouring are tied between the inner formwork 2 and the outer formwork 1.

[0043] In a specific embodiment of this utility model, in order to provide more stable support, a support block 7 is provided between the left and right adjacent connecting rods 6, and the support block 7 is fixed on the side of the outer template 1 facing the steel sheet pile wall 3. The support block 7 is supported between the outer template 1 and the trapezoidal steel sheet pile 4 connected in reverse.

[0044] A row of support blocks 7 is installed between two adjacent rows of connecting rods 6. The number of rows of support blocks 7 is the same as the number of trapezoidal sheet piles 4 in the reverse connection. The centerline of the row of support blocks 7 is directly opposite to that of the trapezoidal sheet piles 4 in the reverse connection. The support blocks 7 are placed between the sheet pile wall 3 and the outer formwork 1, and their connection with the connecting rods 6 forms a tension and support, precisely controlling the verticality and position of the outer formwork 1.

[0045] Each support block 7 in a row can be on the same horizontal level as the nearest connecting rod 6, or it can be on a different horizontal level from the nearest connecting rod 6.

[0046] In a specific embodiment of this utility model, the thickness of the support block 7 can be a cube-shaped wooden block of about 10cm. The 10cm thick support block 7 is placed between the outer formwork 1 and the reverse connecting trapezoidal steel sheet pile 4, so that the distance between the outer formwork 1 and the steel sheet pile wall 3 is appropriate, the support is stable, it is convenient for later sand filling, and the formwork space is saved.

[0047] In a specific embodiment of this utility model, the connecting rod 6 is connected to the outer template 1 in the following manner: Through holes 8, corresponding one-to-one with sleeves 5, are provided on the outer template 1; nuts 9 are provided on the side of the through holes 8 facing the inside of the pit 13; threads 63 are provided at the end of the horizontal tube 61; the horizontal tube 61 passes through the through holes 8 and is screwed onto the nuts 9 via the threads 63; washers may also be placed between the nuts 9 and the outer template 1. The end of the horizontal tube 61 is fixedly connected by the nuts 9, ensuring a firm and flexible connection. When screwing, the vertical tube 62 faces upwards, and the length of the horizontal tube 61 extending beyond the outer template 1 is controlled as needed.

[0048] The spacing between adjacent sleeves 5 can be determined according to the specific construction conditions. In a specific embodiment of this utility model, the spacing can be 50cm. A connecting rod 6 is set at every 50cm to connect the steel sheet pile wall 3 and the outer formwork 1, so that the connection is firm and stable.

[0049] In one specific embodiment of this utility model, to further stabilize the outer formwork 1, coarse sand is filled between the sheet pile wall 3 and the outer formwork 1 after the formwork is erected. During concrete pouring between the outer formwork 1 and the inner formwork 2, the coarse sand allows for slight displacement of the outer formwork 1. After the concrete solidifies, the frictional resistance of the coarse sand 10 is low when the sheet pile wall 3 is pulled out, facilitating its removal. The support of the coarse sand 10 between the inner wall of the foundation pit 13 and the outer formwork 1 stabilizes the concrete retaining wall. The sheet pile wall 3 can be lifted out using hoisting machinery. If there is no wall sealing at either end of the sheet pile wall 3 and the outer formwork 1, sheet piles or wooden formwork should be used to seal them to prevent the coarse sand 10 from flowing out.

[0050] In one specific embodiment of this utility model, for the stable support of the inner formwork 2, inner formwork 2 and outer formwork 1 are provided on both opposite inner walls of the foundation pit 13, and the opposite inner formwork 2 are supported by a full-span scaffold 11. The foundation pit formwork structure based on steel sheet piles is used on both opposite sides of the foundation pit 13, and a full-span scaffold 11 is set inside the foundation pit 13, with the horizontal pipes 61 of the full-span scaffold 11 supporting the two opposite inner formwork 2.

[0051] In one specific embodiment of this utility model, to further strengthen the inner template 2, U-shaped top members 12 are provided at both ends of the horizontal tube 61 of the full-span scaffold 11. Each U-shaped top member 12 includes a middle plate 121, side plates 122 respectively located at both ends of the middle plate 121, and a screw 123 located in the middle of the side of the middle plate 121 facing away from the side plates 122. A flat nut 124 is screwed onto the screw 123. The screw 123 is inserted into the horizontal tube 61, the flat nut 124 is positioned at the outer end of the horizontal tube 61, and the end of the side plate 122 rests against the inner template 2. The outer diameter of the screw 123 is the same as the inner diameter of the horizontal tube 61.

[0052] Depending on the specific support conditions, the position of the flat nut 124 on the screw 123 can be adjusted, and the screw 123 can be inserted into the horizontal tube 61. The U-shaped top piece 12 is connected to both ends of the horizontal tube 61 and stably supports the inner template 2. The connection of the U-shaped top piece 12 facilitates the adjustment of the support length of the horizontal support, and the support is flexible. If there is no wall sealing at both ends between the inner template 2 and the outer template 1, it should be sealed in a conventional manner.

[0053] The sheet pile-based foundation pit formwork structure according to the present invention is described above by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various modifications can be made to the sheet pile-based foundation pit formwork structure proposed in the present invention without departing from the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the contents of the appended claims.

Claims

1. A foundation pit formwork structure based on steel sheet piles, comprising an outer formwork and an inner formwork, characterized in that, The outer formwork is fixed inside the foundation pit by a steel sheet pile wall, wherein... The sheet pile wall includes trapezoidal sheet piles connected in a positive and negative sequence, with vertical sleeves uniformly welded along the centerline of the positively connected trapezoidal sheet piles. The outer template is provided with connecting rods that correspond one-to-one with the sleeves. The connecting rods include a horizontal tube and a vertical tube that is vertically connected to one end of the horizontal tube. The other end of the horizontal tube is vertically arranged on the outer template, and the vertical tube faces upward. The sheet pile wall is fixed to the bottom edge of the foundation pit, the outer formwork is placed vertically at the bottom of the foundation pit and parallel to the sheet pile wall, and the vertical pipe is inserted into the corresponding sleeve. The inner template is disposed on the side of the outer template facing the foundation pit and has a set distance from the outer template.

2. The foundation pit formwork structure based on steel sheet piles as described in claim 1, characterized in that, A support block is provided between the left and right adjacent connecting rods, and the support block is fixed to the side of the outer template facing the steel sheet pile wall. The support block is supported between the outer template and the trapezoidal steel sheet pile of the reverse connection.

3. The foundation pit formwork structure based on steel sheet piles as described in claim 2, characterized in that, The thickness of the support block is 10cm.

4. The foundation pit formwork structure based on steel sheet piles as described in claim 1, characterized in that, The outer template has through holes corresponding to the sleeves. Nuts are provided on the side of the through holes facing the inside of the pit. Threads are provided at the end of the horizontal tube. The horizontal tube passes through the through holes and is screwed to the nuts through the threads.

5. The foundation pit formwork structure based on steel sheet piles as described in claim 1, characterized in that, The distance between adjacent sleeves is 50cm.

6. The foundation pit formwork structure based on steel sheet piles as described in claim 1, characterized in that, Coarse sand is filled between the sheet pile wall and the outer formwork.

7. The foundation pit formwork structure based on steel sheet piles as described in claim 1, characterized in that, The set spacing is the thickness of the support wall.

8. The foundation pit formwork structure based on steel sheet piles as described in claim 1, characterized in that, Reinforcing bars are tied between the inner formwork and the outer formwork.

9. The foundation pit formwork structure based on steel sheet piles as described in claim 1, characterized in that, The inner formwork and the outer formwork are installed on two opposite inner walls of the foundation pit, and the two opposite inner formworks are supported by full-span scaffolding.

10. The foundation pit formwork structure based on steel sheet piles as described in claim 9, characterized in that, U-shaped top members are provided at both ends of the horizontal tube of the full-span scaffold. The U-shaped top member includes a middle plate, side plates respectively provided at both ends of the middle plate, and a screw rod provided in the middle of the side of the middle plate away from the side plates. A flat nut is screwed on the screw rod. The screw rod is inserted into the horizontal tube. The flat nut is blocked at the port of the horizontal tube. The end of the side plate abuts against the inner template.

Images