Rock area independent foundation trench over-excavation treatment construction structure

Abstract

The utility model discloses a rock area independent foundation trench over-excavation processing construction structure which is located in a rock foundation trench and comprises a cushion layer, the cushion layer is located at the bottom of the rock foundation trench, a reinforcement cage wrapped by concrete is arranged on the top face of the cushion layer, the reinforcement cage comprises a bottom cage, a main reinforcement and a positioning hoop, the bottom cage is located on the top face of the cushion layer, and the main reinforcement is located on the bottom cage. The bottoms of the main reinforcements are vertically inserted into the bottom cage, and a rectangle is defined by the multiple main reinforcements; by arranging a reinforcement cage and a backfill layer, when a foundation trench is excavated to a designed bearing layer on a construction site and the elevation of the bearing layer is lower than the designed elevation, the backfill layer is arranged after bottom cage concrete pouring, so that the top surface of the backfill layer is flush with the elevation of a designed foundation top, and the bottom cage concrete can support the backfill layer, so that the conformity of construction and design assumption is ensured; therefore, the on-site construction period can be prevented from being affected by design change, the foundation construction period can be shortened, foundation trench collapse caused by over-excavation can be avoided, and structural safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of independent foundation construction in rocky areas, in particular to a foundation trench over-excavation processing structure. Background Art

[0002] A foundation trench is a rectangular or square deep hole dug in the underground part of a building, usually used to install the building's foundation structure. When digging a foundation trench in a rocky area, drilling and blasting methods, mechanical crushing methods, etc. are mainly used for construction.

[0003] When constructing in rocky areas, due to the large spacing between geological survey boreholes and the uncertainty of the depth of the bearing layer between the boreholes, on-site independent foundation construction often results in over-excavation. In order to ensure that the actual situation is consistent with the design assumptions, the design unit is usually required to issue a design change based on the actual construction situation on site, and the design change will affect the on-site construction period. In order to avoid the above situation, it is necessary to design and use some structural structures to deal with the over-excavated foundation trench, so as to avoid the design change affecting the on-site construction period, thereby shortening the foundation construction period. Utility Model Content

[0004] The utility model aims to provide an independent foundation trench over-excavation treatment structure in rocky areas, which can shorten the foundation construction period.

[0005] To achieve the above-mentioned purpose, a structural structure for over-excavation treatment of an independent foundation pit in a rocky area is provided, which is located in a rock pit and includes a cushion layer, wherein the cushion layer is located at the bottom of the rock pit, and a concrete-covered steel cage is arranged on the top surface of the cushion layer, wherein the steel cage includes a bottom cage, main bars and positioning hoops, wherein the bottom cage is located on the top surface of the cushion layer, and the bottom of the main bars is vertically inserted into the bottom cage, and a plurality of main bars are arranged, and the plurality of main bars are surrounded into a rectangle, and the positioning hoops are sleeved on the outside of the plurality of main bars and connected to the main bars, and a backfill layer is arranged on the top of the bottom cage on the outside of the plurality of main bars, and a building ground is arranged on the top of the backfill layer.

[0006] The working principle and effect of the above scheme are as follows: the foundation trench is excavated to the designed bearing layer at the construction site. When the bearing layer elevation is lower than the designed elevation, the foundation trench over-excavation treatment structure is used to treat the foundation trench. During the treatment, the original design drawings are first used for construction. The cushion layer is placed at the bottom of the rock foundation trench, and the bottom cage is placed on the cushion layer. The shape and size of the bottom cage are the same as the actual constructed foundation trench. The main reinforcement is arranged vertically and inserted in the bottom cage. Tie wires are provided at the contact between the main reinforcement and the bottom cage. The tie wires can connect the main reinforcement and the bottom cage. Multiple main reinforcements are surrounded into a rectangle with the same shape as the expected construction effect. The positioning hoop is provided on the outside of the multiple main reinforcements, and the connection is connected with tie wires. After the steel cage is built, fillers are provided on the outside of the multiple main reinforcements to form a backfill layer. The backfill layer is located on the top of the bottom cage. The backfill layer is flush with the designed foundation top elevation, and the independent foundation construction can be completed.

[0007] By setting up steel cages and backfill layers, when the foundation pit is excavated to the designed bearing layer at the construction site and the bearing layer elevation is lower than the designed elevation, a backfill layer is set after the bottom cage concrete is poured so that the top surface of the backfill layer is flush with the designed foundation top elevation. The bottom cage concrete can support the backfill layer, thereby ensuring that the construction is consistent with the design assumptions, thereby avoiding design changes affecting the on-site construction period, thereby shortening the foundation construction period, avoiding foundation pit collapse due to over-excavation, and ensuring structural safety.

[0008] According to the described structural structure for over-excavation treatment of independent foundation trenches in rocky areas, the bottom cage includes bottom reinforcement, longitudinal reinforcement and outer hoops, the bottom reinforcement is located on the top surface of the cushion layer, the bottom of the main reinforcement is connected to the bottom reinforcement, a plurality of longitudinal reinforcements are provided, the bottoms of the plurality of longitudinal reinforcements are all connected to the bottom reinforcement, and the plurality of longitudinal reinforcements are connected through outer hoops.

[0009] The bottom cage is composed of bottom reinforcement, longitudinal reinforcement and outer hoops. When installing the bottom cage, the bottom reinforcement is laid on the cushion layer, the longitudinal reinforcement is arranged vertically and connected to the bottom reinforcement, and the outer hoops are set on the outside of multiple longitudinal reinforcements. The bottom reinforcement and longitudinal reinforcement, as well as the outer hoops and longitudinal reinforcement are connected by wire.

[0010] According to the structural structure for over-excavation treatment of independent foundation trenches in rocky areas, a plurality of outer hoops are arranged at intervals up and down, and the spacing between the outer hoops located at the upper part is smaller than the spacing between the outer hoops located at the lower part.

[0011] In the same area, if the spacing between the peripheral hoops is small, the peripheral hoops in this area are relatively dense, and if the spacing between the peripheral hoops is large, the peripheral hoops in this area are relatively sparse.

[0012] According to the structural structure for over-excavation treatment of independent foundation trench in rocky areas, the bottom cage also includes reinforcing ribs, a plurality of which are provided, and two ends of the reinforcing ribs are respectively connected to two oppositely arranged longitudinal bars.

[0013] By setting reinforcing ribs, the reinforcing ribs can strengthen the connection between the longitudinal bars, and further enhance the stability of the bottom cage.

[0014] According to the structural structure for over-excavation treatment of independent foundation trench in rocky areas, bending parts are provided at both ends of the reinforcing ribs, and the bending parts are arranged around the longitudinal ribs.

[0015] The curvature of the bent portion matches the outer side of the longitudinal reinforcement. When the bent portion is arranged around the longitudinal reinforcement, the connection between the longitudinal reinforcement and the reinforcing reinforcement can be strengthened.

[0016] According to the structural structure for over-excavation treatment of independent foundation trenches in rocky areas, a plurality of positioning hoops are provided, and the plurality of positioning hoops are arranged at intervals.

[0017] By setting multiple positioning hoops, the connection between the main reinforcements can be strengthened.

[0018] According to the structural structure for over-excavation treatment of independent foundation trench in rocky areas, the cushion layer and backfill layer are both plain concrete layers.

[0019] Both the cushion layer and the backfill layer are cast with plain concrete. When casting the cushion layer, the plain concrete is directly cast to the bottom of the foundation pit; when casting the plain concrete of the backfill layer, it is necessary to add a formwork on the outside of the steel cage before further casting the plain concrete of the backfill layer.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0022] Figure 1 It is a front cross-sectional view of the first embodiment of the utility model.

[0023] Figure 2 It is a top view of the bottom cage of the first embodiment of the utility model.

[0024] Figure 3 It is a front cross-sectional view of the second embodiment of the utility model.

[0025] Figure 4 It is a top view of the bottom cage of the third embodiment of the utility model.

[0026] Among them: rock foundation trench 10, cushion layer 20, steel cage 30, bottom cage 31, bottom reinforcement 311, longitudinal reinforcement 312, outer stirrups 313, reinforcing reinforcement 314, main reinforcement 32, positioning stirrups 33, backfill layer 40, and building ground 50. DETAILED DESCRIPTION

[0027] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0028] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present utility model, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] like Figure 1-Figure 2 As shown, it is the first embodiment of the utility model, which is suitable for foundation trenches with an excavation depth not exceeding 2.5 meters; the structure is located in a rock foundation trench 10, and includes a cushion layer 20, which is located at the bottom of the rock foundation trench 10, and a concrete-coated steel cage 30 is arranged on the top surface of the cushion layer 20, and the steel cage 30 includes a bottom cage 31, main bars 32 and positioning hoops 33, the bottom cage 31 is located on the top surface of the cushion layer 20, and the bottom of the main bars 32 is vertically inserted in the bottom cage 31, and a plurality of main bars 32 are arranged, and the plurality of main bars 32 are surrounded into a rectangle, and the positioning hoops 33 are sleeved on the outside of the plurality of main bars 32 and connected to the main bars 32, and a backfill layer 40 is arranged on the top of the bottom cage 31 on the outside of the plurality of main bars 32, and a building ground 50 is arranged on the top of the backfill layer 40.

[0032] Specifically, the foundation trench is excavated to the designed bearing layer at the construction site. When the bearing layer elevation is lower than the designed elevation, the foundation trench over-excavation treatment structure is used to treat the foundation trench. During the treatment, the original design drawings are first used for construction. The cushion layer 20 is placed at the bottom of the rock foundation trench 10, and the bottom cage 31 is placed on the cushion layer 20. The shape and size of the bottom cage 31 are the same as the actual foundation trench. The main reinforcement 32 is vertically arranged and inserted into the bottom cage 31. The contact between the main reinforcement 32 and the bottom cage 31 is provided with a wire tie. The wire tie can connect the main reinforcement 32 and the bottom cage 31. The multiple main reinforcements 32 are surrounded into a rectangle with the same shape as the expected construction effect. The positioning hoop 33 is sleeved on the outside of the multiple main reinforcements 32, and the connection is connected with the wire tie. After the steel cage 30 is built, fillers are arranged on the outside of the multiple main reinforcements 32 to form a backfill layer 40. The backfill layer 40 is located on the top of the bottom cage 31. The backfill layer 40 is flush with the designed foundation top elevation, and the independent foundation construction can be completed.

[0033] Optionally, the bottom cage 31 includes bottom reinforcement 311, longitudinal reinforcement 312 and peripheral hoop 313, the bottom reinforcement 311 is located on the top surface of the cushion layer 20, the bottom of the main reinforcement 32 is connected to the bottom reinforcement 311, a plurality of longitudinal reinforcements 312 are provided, the bottoms of the plurality of longitudinal reinforcements 312 are all connected to the bottom reinforcement 311, and the plurality of longitudinal reinforcements 312 are connected through the peripheral hoop 313.

[0034] Optionally, a plurality of the peripheral hoops 313 are arranged at intervals up and down, and the spacing between the peripheral hoops 313 located at the upper part is smaller than the spacing between the peripheral hoops 313 located at the lower part.

[0035] Optionally, the bottom cage 31 further includes a reinforcing rib 314 , wherein a plurality of reinforcing ribs 314 are provided, and two ends of the reinforcing rib 314 are respectively connected to two oppositely arranged longitudinal ribs 312 .

[0036] Optionally, both ends of the reinforcing rib 314 are provided with a bending portion, and the bending portion is arranged around the longitudinal rib 312 .

[0037] Optionally, a plurality of positioning hoops 33 are provided, and the plurality of positioning hoops 33 are arranged at intervals.

[0038] Optionally, the cushion layer 20 and the backfill layer 40 are both plain concrete layers.

[0039] Specifically, when the foundation trench over-excavation treatment structure is used to treat the foundation trench, the construction is first carried out according to the original design drawings, and the plain concrete is poured to the bottom of the rock foundation trench 10 to form a cushion layer 20, and the bottom reinforcement 311 is laid on the cushion layer 20, and the longitudinal reinforcement 312 is arranged vertically and connected to the bottom reinforcement 311, and the outer hoop 313 is sleeved on the outside of the plurality of longitudinal reinforcements 312, and the bottom reinforcement 311 and the longitudinal reinforcement 312, and the outer hoop 313 and the longitudinal reinforcement 312 are connected by wire tying. At this time, the bottom cage 31 is installed, and then the main reinforcement 32 is arranged vertically and Inserted in the bottom cage 31, a tie wire is provided at the contact between the main reinforcement 32 and the bottom cage 31, and the tie wire can connect the main reinforcement 32 and the bottom cage 31. Multiple main reinforcements 32 are surrounded to form a rectangle with the same shape as the expected construction effect. The positioning hoop 33 is sleeved on the outside of the multiple main reinforcements 32, and the connection points are connected with the tie wire. After the steel cage 30 is built, plain concrete is arranged on the outside of the multiple main reinforcements 32 to form a backfill layer 40. The backfill layer 40 is located on the top of the bottom cage 31, and the backfill layer 40 is flush with the designed foundation top elevation, thereby completing the independent foundation construction.

[0040] like Figure 3 As shown, it is the second embodiment of the utility model, which is suitable for excavation of foundation trenches with a depth greater than 2.5 meters. Longitudinal reinforcement 312 and peripheral hoops 313 are added to the side walls of the foundation trench in the backfill layer 40 area to further enhance the strength of the plain concrete in the backfill layer 40.

[0041] like Figure 4 The above is the third embodiment of the present utility model, which is applicable to a special-shaped base groove. When the base groove is a special-shaped base groove, the shape of the bottom cage 31 can be set according to the shape of the base groove.

[0042] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An independent foundation trench over-excavation treatment structure in rocky areas, located in a rock trench, characterized in that: It includes a cushion layer, which is located at the bottom of the rock foundation trench. A concrete-covered steel cage is arranged on the top surface of the cushion layer. The steel cage includes a bottom cage, main bars and positioning hoops. The bottom cage is located on the top surface of the cushion layer. The bottom of the main bars is vertically inserted in the bottom cage. Multiple main bars are arranged, and the multiple main bars are surrounded into a rectangle. The positioning hoops are sleeved on the outside of the multiple main bars and connected to the main bars. A backfill layer is arranged on the top of the bottom cage on the outside of the multiple main bars, and a building ground is arranged on the top of the backfill layer.

2. The structure for over-excavation treatment of independent foundation trench in rocky areas according to claim 1 is characterized in that: The bottom cage includes bottom bars, longitudinal bars and peripheral hoops. The bottom bars are located on the top surface of the cushion layer. The bottom of the main bars is connected to the bottom bars. A plurality of longitudinal bars are provided. The bottoms of the plurality of longitudinal bars are all connected to the bottom bars. The plurality of longitudinal bars are connected through peripheral hoops.

3. The structure for over-excavation treatment of independent foundation trench in rocky areas according to claim 2 is characterized in that: A plurality of peripheral hoops are arranged at intervals up and down, and the spacing between the peripheral hoops located at the upper part is smaller than the spacing between the peripheral hoops located at the lower part.

4. The structure for over-excavation treatment of independent foundation trench in rocky areas according to claim 2 is characterized in that: The bottom cage also includes a plurality of reinforcing ribs, and the two ends of the reinforcing ribs are respectively connected to two oppositely arranged longitudinal ribs.

5. The structure for over-excavation treatment of independent foundation trench in rocky areas according to claim 4 is characterized in that: Both ends of the reinforcing rib are provided with bending parts, and the bending parts are arranged around the longitudinal rib.

6. The structure for over-excavation treatment of independent foundation trench in rocky areas according to claim 1 is characterized in that: The positioning hoops are provided in plurality and are arranged at intervals.

7. The structure for over-excavation treatment of independent foundation trench in rocky areas according to claim 1, characterized in that: The cushion layer and the backfill layer are both plain concrete layers.

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