Variable cross-section foundation pit retaining member and construction method thereof

Abstract

The application provides a variable cross-section foundation pit enclosure component and a construction method thereof, wherein the variable cross-section foundation pit enclosure component comprises an upper section component, a lower section component and a connecting assembly; the bottom surface of the upper section component is provided with a protruding part which protrudes outward in a direction away from the upper section component; the top surface of the lower section component is provided with a groove which is matched with the protruding part, and the protruding part is accommodated in the groove when the upper section component is connected with the lower section component; the connecting assembly comprises a connecting end plate and a connecting piece, and the connecting end plate is arranged at the edge of the groove and connected with the upper section component through the connecting piece. In this way, the upper section component and the lower section component are connected through the connecting piece, and the connection quality is easy to guarantee due to the simple structure; meanwhile, the protruding part is embedded in the groove during the connection, and the connection position is compact and reliable through the setting of the bonding material, so that the shear capacity of the connection position is enhanced; in addition, the variable cross-section structure design avoids the waste of materials and reduces the component cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of civil engineering construction, in particular to a variable cross-section foundation pit retaining member and a construction method thereof. BACKGROUND

[0002] In view of the defects of low material utilization rate, more on-site operation and high engineering cost of bored piles as foundation pit retaining structures, engineering and technical personnel have been committed to developing prefabricated concrete members as foundation pit retaining structures in recent years. At present, prefabricated foundation pit retaining members mostly adopt equal cross-section and mechanical connection form, which has the defects of lower material waste and weak connection shear resistance. SUMMARY

[0003] The present application aims to provide a variable cross-section foundation pit retaining member and a construction method thereof, so as to solve the defects of the connection of the current prefabricated assembly retaining member and the problem of material waste of the equal cross-section design.

[0004] In order to achieve the above-mentioned purpose, the present application provides a variable cross-section foundation pit retaining member, comprising: an upper section member, a lower section member and a connecting assembly.

[0005] The bottom surface of the upper section member is provided with a protruding portion which protrudes outwardly in a direction away from the upper section member; the top surface of the lower section member is provided with a groove matched with the protruding portion, and the protruding portion is accommodated in the groove when the upper section member is connected with the lower section member.

[0006] The connecting assembly comprises a connecting end plate and a connecting piece, and the connecting end plate is arranged at the edge of the groove, and the connecting end plate is connected with the upper section member through the connecting piece.

[0007] Optionally, the cross-sectional area of the upper section member is greater than the cross-sectional area of the lower section member.

[0008] Optionally, the cross-sectional area of the groove plus the cross-sectional area of the connecting end plate is less than or equal to the cross-sectional area of the upper section member.

[0009] Optionally, the connecting end plate is integrally formed with the lower section member.

[0010] Optionally, the protruding portion is arranged at the center of the bottom surface of the upper section member, and the groove is arranged at the center of the top surface of the lower section member.

[0011] Optionally, the connecting piece is pre-embedded in the upper section member and protrudes out of the upper section member.

[0012] Optionally, when connected, one end of the connecting piece is anchored into the internal filler of the upper section member, and the other end penetrates into the inside of the connecting end plate.

[0013] Optionally, the groove and / or the upper surface of the connecting end plate are provided with an adhesive material.

[0014] To achieve the above objectives, the present invention also provides a construction method for a variable cross-section foundation pit retaining member, applicable to the variable cross-section foundation pit retaining member as described above, comprising:

[0015] Prefabricate the upper and lower sections of the components and connecting assemblies;

[0016] Fill the groove of the lower component with adhesive material and apply adhesive material to the upper surface of the connecting end plate;

[0017] The upper section component is hoisted so that the protrusion is embedded in the groove;

[0018] The upper section member and the lower section member are connected by a connector, and a preload is applied.

[0019] The components were sunk to the design elevation.

[0020] To achieve the above objectives, the present invention also provides a construction method for a variable cross-section foundation pit retaining member, applicable to the variable cross-section foundation pit retaining member as described above, comprising:

[0021] Prefabricate the upper and lower sections of the components and connecting assemblies;

[0022] The lower section component is sunk into the soil;

[0023] Fill the groove of the lower component with adhesive material and apply adhesive material to the upper surface of the connecting end plate;

[0024] The upper section component is hoisted so that the protrusion is embedded in the groove;

[0025] The upper section member and the lower section member are connected by a connector, and a preload is applied.

[0026] The components were sunk to the design elevation.

[0027] In summary, the variable cross-section foundation pit retaining component and its construction method proposed in this invention include: an upper section component, a lower section component, and a connecting assembly; the bottom surface of the upper section component has a protrusion that protrudes outward in a direction away from the upper section component; the top surface of the lower section component has a groove adapted to the protrusion, and the protrusion is accommodated in the groove when the upper and lower sections are connected; the connecting assembly includes a connecting end plate and a connector, the connecting end plate is disposed at the edge of the groove, and the connecting end plate is connected to the upper section component through the connector. Compared with existing foundation pit retaining components, this application has the following advantages:

[0028] The upper section member and the lower section member are connected through the connecting piece, simple in structure and easy to ensure the connection quality; meanwhile, the convex part is embedded in the groove during the connection, and the adhesive material is arranged, so that the connection position is compact and reliable, and the shear capacity of the connection position is enhanced; in addition, the cross-sectional area of the upper section member is larger than that of the lower section member, and the variable cross-section structure design is adopted, so that the material waste is avoided, and the component cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A structure schematic view of the variable cross-section foundation pit enclosure component is provided for the embodiment of the present application.

[0030] Figure 2 A sectional view of the upper section member is provided for the embodiment of the present application.

[0031] Figure 3 A sectional view of the connection between the upper section member and the lower section member is provided for the embodiment of the present application.

[0032] Figure 4 A sectional view of the lower section member is provided for the embodiment of the present application.

[0033] Figure 5 A schematic view of step S1 is provided for the first embodiment of the present application.

[0034] Figure 6 A schematic view of step S2 is provided for the first embodiment of the present application.

[0035] Figure 7 Schematic views of steps S3 and S4 are provided for the first embodiment of the present application.

[0036] Figure 8 A schematic view of step S5 is provided for the first embodiment of the present application.

[0037] Figure 9 A schematic view of step S1 is provided for the second embodiment of the present application.

[0038] Figure 10 A schematic view of step S2 is provided for the second embodiment of the present application.

[0039] Figure 11 Schematic views of steps S3, S4 and S5 are provided for the second embodiment of the present application.

[0040] Figure 12 A schematic view of step S6 is provided for the second embodiment of the present application.

[0041] Wherein, the explanations of the respective reference signs are as follows:

[0042] 1-upper section member; 11-convex part

[0043] 2- lower member; 21- groove;

[0044] 3- connecting assembly; 31- connecting end plate; 32- connecting member;

[0045] 4- anchor. DETAILED DESCRIPTION

[0046] In order to make the objects, advantages and features of the present application more clearly, the following further describes the present application in conjunction with the drawings and specific embodiments. It should be noted that the drawings are very simplified and not drawn in proportion, and are only used to facilitate and clearly assist the purpose of describing the embodiments of the present application. In addition, the structures shown in the drawings are often a part of the actual structures. In particular, the emphasis shown in each drawing is different, and sometimes different proportions are used.

[0047] As used in the present specification, the singular forms "a", "an" and "the" include plural objects, the term "or" is generally used in the sense of "and / or", the term "several" is generally used in the sense of "at least one", the term "at least two" is generally used in the sense of "two or more", and in addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third" can explicitly or implicitly include one or at least two of the features, "one end" and "the other end" and "proximal end" and "distal end" generally refer to two parts corresponding to each other, which not only includes the end points, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements. In addition, as used in the present specification, a component is provided in another component, which generally only indicates that there is a connection, coupling, cooperation or transmission relationship between the two components, and the connection, coupling, cooperation or transmission between the two components can be direct or indirect through an intermediate component, and cannot be understood as indicating or implying the spatial positional relationship between the two components, i.e. one component can be in any orientation inside, outside, above, below or one side of another component, unless the content is otherwise explicitly indicated. The terms "up", "down", "top", "bottom" are generally arranged in the direction of gravity; the terms "vertical direction" generally refer to the direction along the gravity, which is generally perpendicular to the ground, and the terms "horizontal direction" generally refer to the direction parallel to the ground; for those skilled in the art, the specific meaning of the above terms in the present specification can be understood according to the specific circumstances.

[0048] The present application aims to provide a variable cross-section foundation pit retaining member and a construction method thereof, so as to solve the problems of defects in the connection of the current prefabricated retaining member and material waste in the design of the equal cross-section.

[0049] The following is described with reference to the accompanying drawings.

[0050] It should be noted that in the present embodiment, the up and down of the upper segment member and the lower segment member represent the relative position relationship of the members along the gravity direction, and correspondingly, the top surface and the bottom surface also represent the relative surfaces of the members along the gravity direction.

[0051] Please refer to Figures 1 to 4 The present application provides a variable cross-section foundation pit retaining member, comprising: an upper segment member 1, a lower segment member 2 and a connecting assembly 3; the bottom surface of the upper segment member 1 is provided with a protruding part 11, which protrudes outward in the direction away from the upper segment member 1; the top surface of the lower segment member 2 is provided with a groove 21 matched with the protruding part 11, and the protruding part 11 is accommodated in the groove 21 when the upper segment member 1 and the lower segment member 2 are connected; the connecting assembly 3 comprises a connecting end plate 31 and a connecting piece 32, the connecting end plate 31 is arranged at the edge of the groove 21, and the connecting end plate 31 is connected with the upper segment member 1 through the connecting piece 32. Those skilled in the art can understand that the foundation pit retaining member adopted in the present application is a segmented prefabricated member, and each segment can select the optimal cross-sectional shape, size and reinforcement according to its stress requirement; in the present embodiment, the cross sections of the upper segment member 1, the lower segment member 2 and the connecting end plate 31 are all rectangular; at the same time, the protruding part 11 is arranged on the bottom surface of the upper segment member 1, and the groove 21 matched with the protruding part 11 is arranged on the top surface of the lower segment member 2, and the protruding part 11 is embedded in the groove 21 during connection to form a shear key, which further improves the shear capacity of the connection between the upper segment member 1 and the lower segment member 2. In some other embodiments, the cross-sectional shape of the upper segment member 1 and the lower segment member 2 can also be I-shaped or box-shaped, and correspondingly, the cross-sectional shape of the connecting end plate 31 can also be a shape matched therewith; at the same time, the protruding part 11 can also be arranged on the top surface of the lower segment member 2, and correspondingly, the groove 21 needs to be arranged on the bottom surface of the upper segment member 1, which can be configured according to the actual situation by those skilled in the art.

[0052] In this way, since most of the existing foundation pit retaining members are cast-in-place members, the cost is high; although there are also whole prefabricated members, the transportation is difficult due to the large size; while the variable cross-section foundation pit retaining member provided by the present application adopts a segmented prefabricated structure, which is convenient for transportation, and at the same time, a shear key is arranged at the connection between the upper segment member 1 and the lower segment member 2, which further improves the shear capacity of the connection, and also simplifies the connection mode of the retaining member, thereby improving the construction efficiency.

[0053] Further, please continue to refer to Figures 1 to 4The sectional area of the upper segment member 1 is greater than the sectional area of the lower segment member 2. In this way, the sectional area of the upper segment member 1 is greater than the sectional area of the lower segment member 2, and the variable cross-section design can determine the required sectional area according to the stress requirement of each segment member, and can also reduce material waste and reduce the cost of prefabricated components. Preferably, the sectional area of the groove 21 plus the sectional area of the connecting end plate 31 is less than or equal to the sectional area of the upper segment member 1. To ensure the connection strength at the variable cross-section, connecting end plates 31 are arranged at the edges of the groove 21, so that the sectional area of the groove 21 plus the sectional area of the connecting end plate 31 is less than or equal to the sectional area of the upper segment member 1, and a support is arranged below the connecting end plate 31 to form a triangular stable structure, further strengthening the strength at the variable cross-section. It should be noted that in this embodiment, the upper segment member 1 and the lower segment member 2 are variable cross-section members, and in other embodiments, the upper segment member 1 and the lower segment member 2 can also be constant cross-section members, and the number of segments of the entire enclosure member can be any integer greater than or equal to 2, which can be configured by those skilled in the art according to actual conditions.

[0054] In an optional embodiment, the protrusion 11 is arranged at the center of the bottom surface of the upper segment member 1, and the groove 21 is arranged at the center of the top surface of the lower segment member 2. Those skilled in the art can understand that, considering the influence of the eccentric structure on the stress of the component, the protrusion 11 and the groove 21 of the present application are arranged at the center respectively; of course, in other embodiments, the protrusion 11 and / or the groove 21 can also be arranged at other positions to form an eccentric structure, but it should be noted that if an eccentric structure is formed, the connecting end plates 31 on both sides will need to be arranged as components of different sizes according to the actual stress situation.

[0055] Please continue to refer to Figure 1 The connecting end plate 31 is integrally formed with the lower segment member 2, and the connecting piece 32 is embedded in the upper segment member 1 and protrudes from the upper segment member 1. In this embodiment, the connecting end plate 31 is integrally formed with the lower segment member 2, one end of the connecting piece 32 is embedded in the upper segment member 1, and the other end protrudes from the upper segment member 1 for connection with the lower segment member 2; of course, in other embodiments, the connecting end plate 31 can be integrally formed with the upper segment member 1, and one end of the connecting piece 32 can also be embedded in the lower segment member 2, and those skilled in the art can configure the position and connection relationship of the connecting piece 32 and the connecting end plate 31 according to actual conditions.

[0056] Further, the connecting member 32 is anchored in the interior filler of the upper segment member 1 at one end and penetrates into the interior of the connecting end plate 31 at the other end. It should be noted that in the present embodiment, the interior filler can be concrete or other materials, and the connecting member 32 is a bolt, and the corresponding positions of the upper segment member 1 and the connecting end plate 31 are provided with bolt holes so as to facilitate the penetration of the connecting member 32 therein. In other embodiments, the upper segment member 1 and the lower segment member 2 can also be connected by welding or other connection methods.

[0057] As an alternative embodiment, the recess 21 and / or the upper surface of the connecting end plate 31 is provided with adhesive material. It should be noted that in the present embodiment, the adhesive material includes one or more of high-strength grouting material, epoxy resin, and in other embodiments, the adhesive material can also be other materials with adhesive effect. Meanwhile, in the present embodiment, the recess 21 is provided with a plurality of protrusions 22, and the connecting end plate 31 is provided with a plurality of protrusions 32, and the protrusions 22 and the protrusions 32 are arranged in a corresponding manner. Figure 1 In the exemplary embodiment shown, the connecting end plate 31 and the lower segment member 2 are also provided with an anchor 4 connected to the main reinforcement of the lower segment member 2 to increase the connection strength between the connecting end plate 31 and the lower segment member 2, and of course in other embodiments, the connection between the upper segment member 1 and the lower segment member 2 can also be provided with other components capable of strengthening the connection strength.

[0058] Please refer to Figures 5 to 8 The present application also provides a construction method of a variable cross-section foundation pit enclosure member, which is applied to the variable cross-section foundation pit enclosure member as described above, and comprises the following steps:

[0059] Step S1: prefabricating the upper segment member 1, the lower segment member 2 and the connecting assembly 3;

[0060] Step S2: pouring adhesive material into the recess 21 of the lower segment member 2 and smearing adhesive material on the upper surface of the connecting end plate 31;

[0061] Step S3: hoisting the upper segment member 1 so that the protrusions 11 are embedded in the recess 21;

[0062] Step S4: connecting the upper segment member 1 and the lower segment member 2 by the connecting member 32 and applying a pre-tightening force;

[0063] Step S5: sinking the prefabricated foundation pit enclosure member to the design elevation.

[0064] Please refer to Figures 9 to 12 The present application also provides a construction method of a variable cross-section foundation pit enclosure member, which is applied to the variable cross-section foundation pit enclosure member as described above, and comprises the following steps:

[0065] Step S1: prefabricating the upper segment member 1, the lower segment member 2 and the connecting assembly 3;

[0066] Step S2: sinking the lower segment member 2 into the soil;

[0067] Step S3: pouring adhesive material in the groove 21 of the lower segment member 2, and smearing the adhesive material on the upper surface of the connecting end plate 31;

[0068] Step S4: hoisting the upper segment member 1, and embedding the protruding part 11 in the groove 21;

[0069] Step S5: connecting the upper segment member 1 and the lower segment member 2 through the connecting member 32, and applying pre-tightening force;

[0070] Step S6: sinking the members to the design elevation.

[0071] It should be noted that, in the exemplary embodiment shown, Figures 5 to 8 in the exemplary embodiment shown, the construction method adopted is pre-assembly (i.e. the upper segment member and the lower segment member are assembled first and then sunk to the design elevation); in the exemplary embodiment shown, Figures 9 to 12 in the exemplary embodiment shown, the construction method adopted is in-situ assembly (i.e. the lower segment member is sunk into the soil first, the upper segment member is connected, and finally sunk to the design elevation together); the person skilled in the art can determine which construction method to adopt according to the situation at the construction site. In the embodiment, the number of the upper segment member 1 and the lower segment member 2 can be multiple; the material of the upper segment member 1 and the lower segment member 2 can be the same or different; the cross-sectional shape, size and reinforcement of each segment member can be arbitrarily configured according to requirements; the upper segment member 1 and the lower segment member 2 can be connected in the center or not; the connection between the upper segment member 1 and the lower segment member 2 can be provided with shear keys, filled with adhesive material or pre-tightening force, or only part of the contents; the range, thickness, material type and material specification of the filled adhesive material are not limited; the number, position, shape and size of the shear keys are not limited; the number, position, shape, size, material and specification of the connecting member 32 are not limited, and the person skilled in the art can flexibly configure them.

[0072] In summary, in the variable cross-section foundation pit enclosure member and the construction method thereof provided in the embodiment of the application, the variable cross-section foundation pit enclosure member comprises an upper segment member, a lower segment member and a connecting assembly; the bottom surface of the upper segment member is provided with a protruding part which protrudes outward in a direction away from the upper segment member; the top surface of the lower segment member is provided with a groove which is adapted to the protruding part, and the protruding part is accommodated in the groove when the upper segment member and the lower segment member are connected; the connecting assembly comprises a connecting end plate and a connecting member, the connecting end plate is arranged at the edge of the groove, and the connecting end plate is connected with the upper segment member through the connecting member. Compared with the existing foundation pit enclosure member, the application has the following advantages:

[0073] The upper section member and the lower section member are connected through the connecting piece, simple in structure and easy to ensure the connection quality; meanwhile, the convex part is embedded in the groove during the connection, and the adhesive material is arranged to make the connection position compact and reliable, thereby enhancing the shear capacity of the connection position; in addition, the cross-sectional area of the upper section member is larger than that of the lower section member, and a variable cross-section structure is adopted, so that the material waste is avoided, and the component cost is reduced.

[0074] The above description is only a description of the preferred embodiments of the present application, and is not any limitation on the scope of the present application. Any modification or change made by a person skilled in the art according to the above disclosure is within the protection scope of the claims.

Claims

1. A variable cross-section excavation enclosure member, characterized by, The utility model relates to a prefabricated segmental concrete column, which comprises: an upper segmental member, a lower segmental member and a connecting assembly; a bottom surface of the upper segmental member is provided with a protruding part which protrudes outward in a direction away from the upper segmental member; a top surface of the lower segmental member is provided with a groove which is matched with the protruding part, and the protruding part is accommodated in the groove to form a shear key when the upper segmental member is connected with the lower segmental member; the connecting assembly comprises a connecting end plate and a connecting piece, the connecting end plate is arranged at the edge of the groove, and the connecting end plate is connected with the upper segmental member through the connecting piece; the connecting end plate is integrally formed with the lower segmental member, the connecting piece is pre-embedded in the upper segmental member and protrudes from the upper segmental member to be connected with the lower segmental member; an anchoring piece is further arranged at the connecting position of the connecting end plate and the lower segmental member, and the anchoring piece is connected with the main reinforcement of the lower segmental member to increase the connecting strength between the connecting end plate and the lower segmental member; the protruding part is arranged at a non-central position of the bottom surface of the upper segmental member, and / or the groove is arranged at a non-central position of the top surface of the lower segmental member to form an eccentric structure; the sectional area of the upper segmental member is greater than the sectional area of the lower segmental member.

2. The variable cross-section excavation enclosure member of claim 1, wherein, the sectional area of the groove plus the sectional area of the connecting end plate is less than or equal to the sectional area of the upper segmental member.

3. The variable cross-section excavation enclosure member of claim 2, wherein, when connected, one end of the connecting piece is anchored in the internal filler of the upper segmental member, and the other end of the connecting piece penetrates into the internal part of the connecting end plate.

4. The variable cross-section excavation enclosure member of claim 1, wherein the upper surface of the groove and / or the connecting end plate is provided with a bonding material.

5. A construction method of a variable cross-section excavation retaining member, applied to the variable cross-section excavation retaining member according to any one of claims 1 to 4, characterized by, The utility model relates to a prefabricated segmental concrete column, which comprises: a prefabricated upper segmental member, a lower segmental member and a connecting assembly; bonding material is poured into the groove of the lower segmental member, and bonding material is applied to the upper surface of the connecting end plate; the upper segmental member is hoisted so that the protruding part is embedded in the groove; the upper segmental member and the lower segmental member are connected through the connecting piece, and pre-tightening force is applied; the member is sunk to the design elevation.

6. A construction method of a variable cross-section excavation retaining member, applied to the variable cross-section excavation retaining member according to any one of claims 1 to 4, characterized by, The utility model relates to a prefabricated segmental concrete column, which comprises: a prefabricated upper segmental member, a lower segmental member and a connecting assembly; the lower segmental member is sunk into the soil; bonding material is poured into the groove of the lower segmental member, and bonding material is applied to the upper surface of the connecting end plate; the upper segmental member is hoisted so that the protruding part is embedded in the groove; the upper segmental member and the lower segmental member are connected through the connecting piece, and pre-tightening force is applied; the member is sunk to the design elevation.

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