Construction method of shallow foundation pit slope support in narrow area

Abstract

The application discloses a construction method of a shallow foundation pit slope foot support in a narrow area, and belongs to the field of foundation pit support engineering construction. The method comprises the following steps: before the construction of the foundation pit excavation, measuring and setting out the foundation pit excavation range; excavating the foundation pit, excavating the foundation pit downward according to the designed slope coefficient until the designed design elevation of the excavation; measuring the range of the minimum working surface of the pit bottom, spreading lime, cutting the slope foot in the minimum working surface range for 3-5 m long, quickly driving wood piles with a length of more than 2 m at the slope foot of the cutting for 3-5 m, and the interval of the wood piles is 1 m per root; the cross beam is nailed on the baffle in advance, and then inserted into the baffle; after the wood piles and the baffle are completely installed around the foundation pit, rain cloth is laid on the slope; sand bags are pressed between the slope foot and the baffle, and the stability of the slope is further increased; after the above support work is completed, subsequent construction should be quickly carried out, backfilling is strived for as early as possible, and safety is ensured. The application solves the problem that the slope coefficient cannot meet the requirements, and designs a construction method of strengthening the support of the slope foot.

Description

Technical Field

[0001] This invention belongs to the field of foundation pit support engineering construction, specifically relating to a construction method for slope toe support of shallow foundation pits in narrow areas. Background Technology

[0002] In recent years, there have been occasional instances of excavating foundation pits for public infrastructure construction in relatively narrow areas. Due to the presence of surrounding structures or buildings that need protection, it is impossible to excavate the foundation pits entirely according to the designed slope coefficient, which poses certain safety and quality risks. If traditional support pile methods are used for support construction, the project cost will increase.

[0003] Therefore, the present invention provides a support construction technique for the slope toe when the slope coefficient cannot meet the requirements for excavating foundation pits in narrow areas. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this invention. This invention discloses a construction method for slope toe support of shallow foundation pits in narrow areas, comprising the following steps:

[0005] Step 1: Before excavating the foundation pit, measure and mark out the excavation area according to the design drawings, and take protective measures.

[0006] Begin excavating the foundation pit, and excavate downwards according to the slope coefficient required by the design until the design elevation is reached;

[0007] Step 2: Measure the minimum working area at the bottom of the pit, sprinkle lime on it, and cut a 3-5m long section of the slope toe within the minimum working area. Within a certain slope self-stabilization time, quickly drive wooden stakes with a length of more than 2m into the 3-5m section of the slope toe, with a spacing of 1m between each stake.

[0008] Step 3: Nail the crossbeams to the baffle in advance. After the wooden stakes within a 3-5m range are driven in, insert the baffle and nail the wooden stakes to the crossbeams firmly. After all the wooden stakes and baffles are installed around the perimeter of the foundation pit, lay a tarpaulin on the slope to prevent rainwater from entering the slope.

[0009] Step 4: Place sandbags between the toe of the slope and the retaining wall to further increase the stability of the slope. After the above support work is completed, subsequent construction should be carried out as soon as possible to ensure safety.

[0010] In a further technical solution, multiple sets of wooden piles are provided, and baffles are installed between adjacent wooden piles;

[0011] The baffle is detachably connected to the transverse rib.

[0012] In a further technical solution, a fixing frame is installed on the wooden stake, and a pressing member is installed on the top of the fixing frame, the pressing member being adapted to abut against the sandbag.

[0013] In a further technical solution, the bottom of the fixing frame is provided with a connecting plate, which is detachably connected to the bottom of the wooden stake. The top of the fixing frame is provided with an inclined sliding groove, and multiple sets of positioning holes are opened on the inclined sliding groove. The pressing component includes a fixing cylinder, and the positioning hole is a threaded hole. The inner diameter of the fixing cylinder is adapted to the inner diameter of the threaded hole and is suitable for installing a fixing screw.

[0014] The fixing screw is adapted to connect the threaded hole and the fixing cylinder by thread, and is locked in place by a locking nut.

[0015] In a further technical solution, the pressing component includes a connecting rod and a pressing plate, and a fixing cylinder is provided at the end of the connecting rod;

[0016] The connecting rod is π-shaped and is fixedly connected to the lower pressure plate.

[0017] In a further technical solution, the lower pressure plate is provided with a position hole, which is a threaded hole and a fixing rod is installed thereon. The fixing rod is suitable for insertion into the slope and the depth is not less than 1 / 3 of the height of the baffle.

[0018] In a further technical solution, the tarpaulin is provided with a reserved hole and a sealing strip. The reserved hole is suitable for fixing the insertion of the plug rod. The end of the lower pressure plate is provided with a shielding cloth. One end of the shielding cloth is detachably connected to the end of the lower pressure plate, and the other end is detachably connected to the sealing strip.

[0019] Compared with the prior art, the present invention can achieve the following technical effects:

[0020] This invention solves the problem of not being able to excavate foundation pits according to the designed slope coefficient in narrow areas by first excavating the foundation pit according to the designed slope coefficient, then removing the excess slope toe, and using wooden piles, baffles, and sandbags to support the slope toe to prevent slope collapse. It replaces the construction of traditional support piles at a lower cost, greatly reduces the project cost, and creates huge benefits for the project. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional view of the shallow foundation pit in Embodiment 1 of the present invention;

[0023] Figure 2 This is a schematic elevation view of the wooden pile of the present invention;

[0024] Figure 3 This is a schematic elevation view of the wooden pile according to Embodiment 2 of the present invention;

[0025] Figure 4 This is a schematic diagram of the fixing frame in Embodiment 2 of the present invention;

[0026] Figure 5 This is a schematic cross-sectional view of the oblique slide rail of the present invention;

[0027] Figure 6 This is a front view of the shielding cloth of the present invention.

[0028] In the diagram: 1. Sandbag; 2. Slope; 3. Baffle; 4. Horizontal rib; 5. Wooden stake; 6. Rain cover; 7. Fixing frame; 8. Connecting plate; 9. Inclined chute; 10. Fixing cylinder; 11. Fixing screw; 12. Connecting rod; 13. Lower pressure plate; 14. Position hole; 15. Fixing rod; 16. Reserved hole; 17. Sealing strip; 18. Covering cloth. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] The application principle of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] like Figures 1 to 2 The diagram illustrates one embodiment of the present invention: a construction method for slope toe support of shallow foundation pits in narrow areas, comprising the following steps:

[0033] Step 1: Before excavating the foundation pit, measure and mark out the excavation area according to the design drawings, and take protective measures.

[0034] Begin excavating the foundation pit, and excavate downwards according to the slope coefficient required by the design until the design elevation is reached;

[0035] Step 2: Measure the minimum working area at the bottom of the pit, sprinkle lime, and cut a 3-5m long section of the slope toe within the minimum working area. Within a certain self-stabilizing time of the slope 2, quickly drive wooden stakes 5 with a length of more than 2m into the 3-5m section of the slope toe, with a spacing of 1m between each stake 5.

[0036] Step 3: Nail the horizontal beam 4 onto the baffle 3 in advance. After the wooden stakes 5 within a range of 3-5m are driven in, insert the baffle 3 and nail the wooden stakes 5 to the horizontal beam 4 firmly. After all the wooden stakes 5 and baffle 3 are installed around the foundation pit, lay the tarpaulin 6 on the slope 2 to prevent rainwater from entering the slope 2.

[0037] Step 4: Place sandbags 1 between the slope toe and retaining plate 3 to further increase the stability of slope 2. After the above support work is completed, subsequent construction should be carried out as soon as possible to ensure safety.

[0038] like Figure 2 As shown, multiple sets of wooden stakes 5 are provided, and baffles 3 are installed between adjacent wooden stakes 5; the baffles 3 are detachably connected to the crossbeams 4.

[0039] In a further technical solution, a fixing frame 7 is installed on the wooden stake 5, and a pressing member is installed on the top of the fixing frame 7, which is adapted to abut against the sandbag 1.

[0040] Example 2

[0041] like Figures 3 to 6 As shown, another embodiment of the present invention is provided. Based on embodiment 1, in order to enhance the connection strength between the top of the wooden pile and the slope in actual practice and avoid impact failure under extreme weather conditions, the bottom of the fixing frame 7 is provided with a connecting plate 8, which is detachably connected to the bottom of the wooden pile 5. The top of the fixing frame 7 is provided with an inclined sliding groove 9, which has multiple sets of positioning holes. The pressing component includes a fixing cylinder 10, and the positioning holes are threaded holes. The inner diameter of the fixing cylinder 10 is adapted to the inner diameter of the threaded hole and is suitable for installing the fixing screw 11.

[0042] The fixing screw 11 is adapted to connect the threaded hole and the fixing cylinder 10 by thread, and is locked with a locking nut.

[0043] In a further technical solution, the pressing member includes a connecting rod portion 12 and a pressing plate 13, and a fixing cylinder 10 is provided at the end of the connecting rod portion 12;

[0044] The connecting rod 12 is π-shaped and is fixedly connected to the lower pressure plate 13.

[0045] The lower pressure plate 13 has a position hole 14, which is a threaded hole and is fitted with a fixing rod 15. The fixing rod 15 is suitable for insertion into the slope 2, and the depth is not less than 1 / 3 of the height of the baffle 3. It is not shown in the figure.

[0046] like Figure 6As shown, the rain cover 6 is provided with a reserved hole 16 and a sealing strip 17. The reserved hole 16 is suitable for fixing the insertion rod 15. The end of the lower pressure plate 13 is provided with a shielding cloth 18. One end of the shielding cloth 18 is detachably connected to the end of the lower pressure plate 13, and the other end is detachably connected to the sealing strip 17. Normally, the sealing strip 17 is closed by means of, for example, buckle connection or slot connection.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A construction method for slope toe support of shallow foundation pits in narrow areas, characterized in that, Includes the following steps: Step 1: Before excavating the foundation pit, measure and mark out the excavation area according to the design drawings, and take protective measures. Begin excavating the foundation pit, and excavate downwards according to the slope coefficient required by the design until the design elevation is reached; Step 2: Measure the range of the minimum working surface at the bottom of the pit, sprinkle lime, cut a 3-5m long slope toe within the minimum working surface range, and within a certain slope (2) self-stabilization time, quickly drive wooden piles (5) with a length of more than 2m into the 3-5m slope toe, with a spacing of 1m / pile. Step 3: Nail the crossbeam (4) onto the baffle (3) in advance. After the wooden piles (5) within a range of 3-5m are driven, insert the baffle (3) and nail the wooden piles (5) and crossbeam (4) firmly. After all the wooden piles (5) and baffles (3) are installed around the foundation pit, lay a tarpaulin (6) on the slope (2) to prevent rainwater from entering the slope (2). Step 4: Place sandbags (1) between the slope toe and the retaining plate (3) to further increase the stability of the slope (2). After the above support work is completed, subsequent construction should be carried out as soon as possible to ensure safety. The wooden stakes (5) are provided in multiple sets, and baffles (3) are installed between adjacent wooden stakes (5). The baffle (3) and the crossbeam (4) are detachably connected; A fixing frame (7) is installed on the wooden stake (5), and a pressing member is installed on the top of the fixing frame (7), which is adapted to abut against the sandbag (1); The bottom of the fixing frame (7) is provided with a connecting plate (8), which is detachably connected to the bottom of the wooden stake (5). The top of the fixing frame (7) is provided with an inclined slide groove (9), which has multiple sets of positioning holes. The pressing component includes a fixing cylinder (10), the positioning hole is a threaded hole, the inner diameter of the fixing cylinder (10) is matched with the inner diameter of the threaded hole, and it is suitable for installing a fixing screw (11). The fixing screw (11) is adapted to connect the threaded hole to the fixing cylinder (10) and to be locked with a locking nut; The pressing component includes a connecting rod (12) and a pressing plate (13), and a fixing cylinder (10) is provided at the end of the connecting rod (12). The connecting rod (12) is "π" shaped and is fixedly connected to the lower pressure plate (13); The lower pressure plate (13) is provided with a position hole (14), which is a threaded hole and is equipped with a fixing rod (15). The fixing rod (15) is suitable for insertion into the slope (2) and the depth is not less than 1 / 3 of the height of the baffle (3). The rain cover (6) is provided with a reserved hole (16) and a sealing strip (17). The reserved hole (16) is suitable for fixing the insertion of the plug (15). The end of the lower pressure plate (13) is provided with a shielding cloth (18). One end of the shielding cloth (18) is detachably connected to the end of the lower pressure plate (13), and the other end is detachably connected to the sealing strip (17).

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