House building foundation pit supporting structure and construction method thereof

Abstract

The invention relates to the technical field of house building foundation pit supporting, and discloses a house building foundation pit supporting structure and a construction method thereof.The house building foundation pit supporting structure comprises a supporting layer, an anchoring assembly and a deformation assembly; the anchoring assembly comprises an anchor rod, and the anchor rod partially penetrates through the supporting layer and is embedded into the soil layer. The deformation assembly comprises a sleeve, a barrier strip, a sliding part, a detonator and a limiting piece, the sleeve is in threaded connection with the anchor rod, one end of the barrier strip is connected with the sleeve, the sliding part is slidably arranged in the sleeve and connected with the barrier strip, and the detonator is arranged in the sleeve and can push the sliding part to slide in the axial direction of the sleeve during detonation; and the limiting piece is connected with the sleeve and is used for limiting the sliding part to reset after sliding. When the detonator explodes, the sliding part is pushed to slide, the sliding part drives the barrier strip to rotate, the barrier strip is rotationally inserted into the soil layer, the limiting piece can limit resetting of the sliding part after sliding, and the barrier strip is prevented from rotating and resetting under self-resetting force and extrusion of the soil layer.

Description

Technical Field

[0001] The invention relates to the technical field of building foundation pit support, and in particular to a building foundation pit support structure and a construction method thereof. Background Art

[0002] Building foundation pit support is a measure of support, reinforcement and protection for the side walls of the foundation pit and the surrounding environment to ensure the safety of underground structure construction and the surrounding environment of the foundation pit during the building process.

[0003] Announcement No. CN107740410A discloses a full-length prestressed anchoring support device capable of combining and expanding an internal anchor body, comprising an inner and outer section anchor rod body and a combined anchoring charge roll arranged at the bottom of a borehole; the inner and outer section anchor rod bodies are connected by a detonating device, the outer section anchor rod body is a hollow rod body, and an opening is arranged on the wall of the hollow rod body; a grout stopper, a tray and a nut are installed at the outer peripheral part of the outer end of the outer section anchor rod body; the combined anchoring charge roll includes an expansion charge roll I, an explosive charge roll II and a quick-setting charge roll III in sequence from the inside to the outside along the bottom of the borehole, and the expansion charge roll I, the explosive charge roll II and the quick-setting charge roll III form corresponding charges in sequence before the anchor rod is installed and before blasting. 3 filling sections; the expansion cartridge I contains expandable chemical components, which can expand the borehole at the tail of the anchor rod by generating volume self-expansion and generate self-expansion squeezing pressure on the rock and soil of the borehole wall; the detonator can detonate the explosives inside the explosive cartridge II, and form a local explosion cavity near the borehole wall stratum around the detonator; at the same time, when the explosives explode, the detonator can automatically open to form an inverted claw structure, and generate a bite force with the surrounding rock and soil; after the inner and outer section anchor rod bodies are prestressed, grouting is performed through the outer section anchor rod body, and grouting can be performed to fill the local blasting cavity, the pores of the free section borehole and the cracks in the rock and soil around the borehole, forming a full-length prestressed support effect.

[0004] The above-mentioned full-length prestressed anchor support device can automatically open the detonator to form an inverted claw structure when the explosives explode, which increases the bite force between the anchor rod body and the soil. However, the inverted claw structure formed by the explosion of the explosives will be partially reset under the squeezing of the soil and the action of its own elastic reset force, which effectively reduces the bite force between the anchor rod body and the soil. Summary of the invention

[0005] In view of this, it is necessary to provide a building foundation pit support structure and a construction method thereof to solve the technical problem that the open inverted claw structure formed by the explosion in the prior art will be reset.

[0006] In order to achieve the above technical objectives, the technical solution of the present invention provides a building foundation pit support structure, comprising: The supporting layer is in line with the slope of the foundation pit; An anchor assembly, including an anchor rod, wherein a portion of the anchor rod passes through the supporting layer and is embedded in the soil layer of the foundation pit; and The deformation assembly includes a sleeve, at least one baffle, a sliding part, a detonator and a limit piece. The sleeve is threadedly connected to the anchor rod, one end of the baffle is connected to the sleeve, the sliding part is slidably built into the sleeve and connected to the baffle. The detonator is built into the sleeve and can push the sliding part to slide along the axial direction of the sleeve during detonation, so that the sliding part pushes the baffle to rotate in a direction away from the axis of the sleeve. The limit piece is connected to the sleeve and is used to limit the sliding part from resetting after sliding.

[0007] In one embodiment, the sleeve is radially provided with a first threaded hole; the sliding portion is peripherally provided with a first annular groove; the limiting member includes a stud, a limiting ball and a spring; the stud is threadedly connected to the first threaded hole; the limiting ball is arranged in the first threaded hole and can be embedded in the first threaded hole when the sliding portion slides through the first threaded hole; the spring abuts against the limiting ball and the stud to provide elastic force for the limiting ball to be embedded in the first annular groove.

[0008] In one embodiment, the deformation assembly further includes at least one push rod, one end of which is hinged to the sliding portion, and the other end of which is hinged to the other end of the blocking bar.

[0009] In one embodiment, the sleeve is provided with at least one strip groove, the strip groove is connected with the interior of the sleeve, the strip groove is arranged along the axial direction of the sleeve, the baffle is rotatably arranged in the strip groove; one end of the push rod is slidably arranged in the strip groove.

[0010] In one embodiment, the sliding portion is sealingly matched with the inner wall of the sleeve.

[0011] In one embodiment, the deformation component further includes a positioning member, which connects the sleeve and the sliding part; when the detonator is detonated, it can push the sliding part to cut off the positioning member.

[0012] In one embodiment, the sliding portion is provided with a second annular groove; the sleeve is provided with a second threaded hole relative to the second annular groove, the positioning member includes a bolt and a cutting portion, the bolt is threadedly connected to the second threaded hole, the cutting portion is connected to the bolt and is provided with a cutting groove, and the cutting groove is located between the inner wall of the sleeve and the outer wall of the sliding portion.

[0013] In one embodiment, the interior of the sleeve is hollow with one end open and the other end closed, and the open end of the sleeve is threadedly connected to the anchor rod; the detonator is built into the closed end of the sleeve, and the sliding portion is arranged at one end of the detonator close to the anchor rod, and when the sliding portion slides to be limited by the limiting member, the sliding portion blocks the communication path between the strip groove and the detonator.

[0014] In one embodiment, the deformation assembly further includes a detonating wire, which is connected to the detonator and extends outside the sleeve.

[0015] The present invention also relates to a construction method of a building foundation pit support structure, using the above-mentioned building foundation pit support structure, comprising the following steps: Excavating earth to form a foundation pit; Repairing the slope of the foundation pit; Drilling holes on the slope of the foundation pit to form anchor holes; Insert the anchor rod and the deformation assembly into the anchor hole; The support layer is attached to the slope of the foundation pit, and the support layer is connected to the anchor rod; Controlling the detonation of detonators; Pour concrete into the anchor holes.

[0016] Compared with the prior art, the beneficial effects of the present invention include: excavating earth to form a foundation pit, trimming the slope of the foundation pit, drilling holes on the slope of the foundation pit to form anchor holes, inserting anchor rods and deformation components into the anchor holes, fitting the support layer to the slope of the foundation pit, and connecting the support layer to the anchor rods, controlling the detonation of detonators, and forming high-pressure and high-kinetic energy gas when the detonators explode to push the sliding part to slide, and the sliding part drives the baffle to rotate in a direction away from the axis of the sleeve, so that the baffle rotates and inserts into the soil layer, which can increase the bonding force between the sleeve, the anchor rod and the soil layer, and can increase the anchoring force between the anchor rod and the soil layer before grouting and in the early stage of concrete curing; the limiter can limit the sliding part to reset after sliding, and reset the baffle after the rotation is limited by the sliding part, so as to prevent the baffle from rotating and resetting under its own reset force and the extrusion of the soil layer; the sleeve of the deformation component is connected to the anchor rod, which can be used in combination with the existing anchor rod; the support layer can reinforce the slope of the foundation pit and prevent the soil layer from sliding into the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the building foundation pit support structure according to one embodiment of the present invention when in use; Figure 2 It is a structural schematic diagram of an anchoring component and a deformation component in a building foundation pit support structure according to an embodiment of the present invention; Figure 3 It is a structural schematic diagram of an anchoring component and a deformation component in a building foundation pit support structure according to an embodiment of the present invention; Figure 4 It is a structural schematic diagram of an anchoring component and a deformation component in a building foundation pit support structure according to an embodiment of the present invention; Figure 5 is along Figure 4 Sectional view along line A-A; Figure 6 yes Figure 5 A partial enlarged schematic diagram of point B in the middle; Figure 7 yes Figure 6 A partial enlarged schematic diagram of point C in the middle; Figure 8 yes Figure 7 A partial enlarged schematic diagram of point D in the middle; Fig. 9 It is a structural schematic diagram of an anchoring component and a deformation component after detonation of a detonator in a building foundation pit support structure according to an embodiment of the present invention; Fig.10 yes Fig. 9 A partial enlarged schematic diagram of point E in the middle.

[0018] Description of reference numerals: Support layer 1; Anchor assembly 2; Anchor 21; Slurry stopper 22; Stop plate 23; Nut 24; Deformation component 3; Sleeve 31; Strip groove 31a; Baffle bar 32; Sliding portion 33; Sealing ring 331; First annular groove 33a; A second annular groove 33b; Detonator 34; Limiting member 35; Stud 351; Limit ball 352; Spring 353; Push rod 36; Positioning member 37; Bolt 371; Cutting section 372; Cutting groove 372a; Detonating line 38; Blocking member 39; Retaining ring 391; Adhesive layer 392. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0020] like Figures 1 to 10 As shown, the present invention provides a building foundation pit support structure, including a support layer 1, an anchor assembly 2 and a deformation assembly 3, the support layer 1 fits the slope of the foundation pit; the anchor assembly 2 includes an anchor rod 21, the anchor rod 21 partially passes through the support layer 1 and is embedded in the soil layer of the foundation pit; the deformation assembly 3 includes a sleeve 31, at least one baffle 32, a sliding portion 33, a detonator 34 and a limiter 35, the sleeve 31 is threadedly connected to the anchor rod 21, one end of the baffle 32 is connected to the sleeve 31, the sliding portion 33 is slidably built into the sleeve 31 and connected to the baffle 32, the detonator 34 is built into the sleeve 31, and can push the sliding portion 33 to slide along the axial direction of the sleeve 31 when detonating, so that the sliding portion 33 pushes the baffle 32 to rotate in a direction away from the axis of the sleeve 31, and the limiter 35 is connected to the sleeve 31 to limit the sliding portion 33 from resetting after sliding.

[0021] Excavate the earth to form a foundation pit, trim the slope of the foundation pit, drill holes on the slope of the foundation pit to form anchor holes, insert the anchor rod 21 and the deformation component 3 into the anchor hole, fit the support layer 1 to the slope of the foundation pit, and connect the support layer 1 to the anchor rod 21, control the detonator 34 to detonate, and when the detonator 34 explodes, high-pressure and high-kinetic energy gas is formed to push the sliding part 33 to slide, and the sliding part 33 drives the blocking bar to rotate in a direction away from the axis of the sleeve 31, so that the blocking bar 32 is rotated and inserted into the soil layer, which can increase the sleeve 31 and the anchor rod 21. The binding force between the anchor rod 21 and the soil layer can be increased before grouting and in the initial stage of concrete curing; the limiter 35 can limit the reset of the sliding part 33 after sliding, and reset the baffle 32 after the rotation is limited by the sliding part 33, so as to prevent the baffle 32 from rotating and resetting under its own reset force and the squeezing of the soil layer; the sleeve 31 of the deformation component 3 is connected to the anchor rod 21, and can be used in combination with the existing anchor rod 21; the supporting layer 1 can reinforce the slope of the foundation pit and prevent the soil layer from sliding into the foundation pit.

[0022] Among them, the supporting layer 1 can be a soil nail wall and a cast-in-place pile retaining wall.

[0023] like Figure 2 , Figure 3 and Figure 4As shown, in one embodiment, the anchor rod 21 is provided with a through hole in the axial direction, and the anchor assembly 2 further includes a grout stopper 22, a grout stopper plate 23 and a nut 24. The grout stopper 22 and the grout stopper plate 23 are sleeved on the anchor rod 21, and the nut 24 is threadedly connected to the anchor rod 21 and abuts against one end of the grout stopper plate 23 away from the grout stopper 22. By providing a through hole in the anchor rod 21, concrete slurry can be injected into the anchor rod 21 through the through hole and pass through the anchor rod 21 into the anchor hole. The grout stopper 22 and the grout stopper plate 23 are used to prevent the concrete slurry from flowing out.

[0024] In order to limit the sliding part 33 after sliding, a spring pin or an elastic protrusion can be provided in the sleeve 31, and the sliding part 33 after sliding can be limited by the spring pin or the elastic protrusion. Specifically, in one embodiment, the sleeve 31 is provided with a first threaded hole in the radial direction; the peripheral wall of the sliding part 33 is provided with a first annular groove 33a, and the limiting member 35 includes a stud 351, a limiting ball 352 and a spring 353, the stud 351 is threadedly connected with the first threaded hole, the limiting ball 352 is provided in the first threaded hole, and can be embedded in the first threaded hole when the sliding part 33 slides through the first threaded hole, and the spring 353 abuts against the limiting ball 352 and the stud 351, and is used to provide elastic force for the limiting ball 352 to be embedded in the first annular groove 33a.

[0025] During the installation of the limiting member 35, the sliding part 33 is first slid into the sleeve 31, and then the limiting ball 352 is inserted into the first threaded hole, and then the spring 353 is embedded, and the stud 351 is threadedly connected to the first threaded hole. The stud 351 pushes the spring 353 to squeeze the limiting ball 352, and at this time the limiting ball 352 abuts against the sliding part 33.

[0026] When the detonator 34 explodes, high-pressure and high-kinetic energy gas is formed to push the sliding part 33 to slide. When the sliding part 33 slides to the first annular groove 33a and aligns with the limiting ball 352, the limiting ball 352 enters the first annular groove 33a under the push of the spring 353. At this time, the limiting ball 352 can limit the sliding part 33 from sliding relative to the sleeve 31.

[0027] Since the thickness of the sleeve 31 is limited, in order to prevent the stud 351 from protruding from the sleeve 31 and to prevent the stud 351 from protruding and hindering the anchor rod 21 from being inserted into the anchor hole, the stud 351, the limiting ball 352 and the spring 353 are installed within the limited thickness, and the limiting functions of the stud 351, the limiting ball 352 and the spring 353 are not affected. Figure 8 As shown, in one embodiment, the side of the limiting ball 352 facing the stud 351 is a plane, and a mounting hole is formed in the plane facing the limiting ball 352 , one end of the spring 353 is embedded in the mounting hole, and the other end is connected to the stud 351 .

[0028] By setting the mounting hole, the mounting space between the limiting ball 352 and the stud 351 can be increased, so that the spring 353 can play an elastic pushing role while increasing the mounting space of the spring 353. By setting the plane, it is convenient to process the mounting hole into the limiting ball 352. The plane can be formed by grinding or other methods.

[0029] It should be understood that part of the blocking bar 32 may be extended toward the inside of the sleeve 31, so that when the sliding portion 33 slides over, the sliding portion 33 pushes the blocking bar 32 to rotate outward from the sleeve 31, or a protruding structure may be provided on the peripheral wall of the sliding portion 33, and when the protruding structure slides over the blocking bar 32, the protruding structure pushes the blocking bar 32 to rotate outward from the sleeve 31. Specifically, as Figure 6 and Fig. 9 As shown, in one embodiment, the deformation component 3 further includes at least one push rod 36 , one end of the push rod 36 is hinged to the sliding portion 33 , and the other end of the push rod 36 is hinged to the other end of the blocking bar 32 .

[0030] When the sliding part 33 slides, the sliding part 33 pushes the blocking bar 32 to rotate outward from the sleeve 31 through the pushing rod 36 until the sliding part 33 is limited by the limiting member 35. At this time, the pushing rod 36 pushes the blocking bar 32 to rotate outward from the sleeve 31, and the pushing rod 36 and the sliding part 33 can support the rotating blocking bar 32.

[0031] The sliding part 33 needs to push the blocking bar 32 through the pushing rod 36, and the blocking bar 32 needs to be intercepted with the sliding part 33 located in the sleeve 31. Figure 4 As shown, in one embodiment, the sleeve 31 is provided with at least one strip groove 31a, the strip groove 31a is connected with the interior of the sleeve 31, the strip groove 31a is arranged along the axial direction of the sleeve 31, and the blocking bar 32 is rotatably arranged in the strip groove 31a; one end of the push rod 36 is slidably arranged in the strip groove 31a.

[0032] By setting the strip groove 31a, the baffle 32 can be embedded in the strip groove 31a. When the deformation component 3 is inserted into the anchor hole, the baffle 32 is built into the strip groove 31a to prevent the baffle 32 from protruding from the sleeve 31 and preventing the baffle 32 from hindering the sleeve 31 from being inserted into the anchor hole; when the sliding part 33 slides, the sliding part 33 pushes the baffle 32 to rotate through the pushing rod 36, so that the baffle 32 rotates to the outside of the strip groove 31a and is embedded in the soil layer.

[0033] When concrete slurry is injected into the anchor rod 21 , the concrete slurry can enter the sleeve 31 and flow out of the sleeve 31 through the strip grooves 31 a of the sleeve 31 .

[0034] It should be understood that the number of the strip groove 31a, the blocking bar 32 and the push rod 36 can be one, two or more. Figure 6 and Fig. 9As shown, in one embodiment, there are multiple strip grooves 31a, baffles 32 and push rods 36, and the multiple strip grooves 31a, baffles 32 and push rods 36 are evenly distributed along the circumference of the sleeve 31, and the strip grooves 31a, baffles 32 and push rods 36 are distributed one by one.

[0035] In one embodiment, the sliding portion 33 is sealingly matched with the inner wall of the sleeve 31 .

[0036] Through the above arrangement, when the detonator 34 explodes to form high-pressure and high-kinetic energy gas, the high-pressure and high-kinetic energy gas can push the sliding part 33 to slide, and the sliding part 33 and the inner wall of the sleeve 31 are sealed and matched, which can prevent the gas from sliding through the inner wall of the sliding part 33 and the sleeve 31, thereby preventing the high-pressure gas from leaking.

[0037] The sliding part 33 may be a cylinder or a rotating body.

[0038] The sliding portion 33 and the inner wall of the sleeve 31 may be sealed by a rubber ring, or by matching the sizes of the sliding portion 33 and the inner wall of the sleeve 31 .

[0039] Specifically, the outer wall of the sliding portion 33 and the inner wall of the sleeve 31 are sealed by a sealing ring 331 .

[0040] In order to position the sliding part 33 in the sleeve 31 , in one embodiment, the deformation assembly 3 also includes a positioning member 37 , which connects the sleeve 31 and the sliding part 33 ; when the detonator 34 is detonated, it can push the sliding part 33 to cut off the positioning member 37 .

[0041] By providing a positioning piece 37 to connect the sleeve 31 and the sliding part 33 in the sleeve 31, the sliding part 33 in the sleeve 31 can be fixed and positioned. When the detonator 34 is detonated, the sliding part 33 can be pushed to cut off the positioning piece 37, thereby preventing the positioning piece 37 from hindering the sliding of the sliding part 33.

[0042] It should be understood that the positioning member 37 can be a screw, a screw, etc. Specifically, Figure 8 and Fig.10 As shown, in one embodiment, the sliding portion 33 is provided with a second annular groove 33b; the sleeve 31 is provided with a second threaded hole relative to the second annular groove 33b, and the positioning member 37 includes a bolt 371 and a cutting portion 372, the bolt 371 is threadedly connected to the second threaded hole, the cutting portion 372 is connected to the bolt 371, and is provided with a cutting groove 372a, and the cutting groove 372a is located between the inner wall of the sleeve 31 and the outer wall of the sliding portion 33.

[0043] Through the above arrangement, the sliding part 33 is slid into the sleeve 31. When it slides to a preset position, the cutting part 372 and the bolt 371 are inserted into the second threaded hole until the cutting part 372 is inserted into the second annular groove 33b. At this time, the cutting part 372 can limit the axial position of the sliding part 33, thereby realizing the positioning of the sliding part 33. When the detonator 34 is detonated, it can push the sliding part 33 to slide, and the sliding part 33 cuts off the cutting part 372 from the cutting groove 372a to avoid hindering the sliding of the sliding part 33.

[0044] It should be understood that the cutting groove 372a can be a notch, a circular groove, etc., which is provided in the cutting portion 372. Specifically, in one embodiment, the cutting groove 372a is annular and is coaxially arranged with the sliding portion 33.

[0045] By setting the cutting groove 372 a to be annular, when the sliding portion 33 slides to the second threaded hole, the cutting portion 372 can be inserted into the cutting groove 372 a without positioning the sliding portion 33 in the circumferential direction.

[0046] like Figure 6 and Fig. 9 As shown, in one of the embodiments, the interior of the sleeve 31 is hollow with one end open and the other end closed, and the open end of the sleeve 31 is threadedly connected to the anchor rod 21; the detonator 34 is built into the closed end of the sleeve 31, and the sliding portion 33 is arranged at one end of the detonator 34 close to the anchor rod 21, and when the sliding portion 33 slides to be limited by the limiting member 35, the sliding portion 33 blocks the communication path between the strip groove 31a and the detonator 34.

[0047] Through the above-mentioned arrangement, the sliding portion 33 is sealed with the inner wall of the sleeve 31, and the closed end of the sleeve 31 can be closed, so that the detonator 34 is in a closed space, and external impurities are prevented from contacting the detonator 34; the sliding portion 33 blocks the communication path between the strip groove 31a and the detonator 34, and the sliding portion 33 can block the communication path between the strip groove 31a and the detonator 34 before and after sliding, so as to prevent external impurities from contacting the detonator 34, and the high-pressure gas formed by the explosion of the detonator 34 is constrained in the cavity between the sliding portion 33 and the closed end of the sleeve 31, and has a certain resistance to limit the reset of the sliding portion 33; and the high-pressure and high-kinetic energy gas formed by the explosion of the detonator 34 does not leak outside the sleeve 31, so as to prevent the leakage of the high-pressure and high-kinetic energy gas from causing the soil layer in the anchor hole to vibrate, and prevent the soil layer in the anchor hole from loosening.

[0048] like Figure 5 , Figure 6 , Figure 7 and Fig. 9 As shown, in one embodiment, the deformation component 3 further includes a detonating wire 38 , which is connected to the detonator 34 and extends outside the sleeve 31 .

[0049] By providing the detonating wire 38 , when detonation is required, the detonation of the detonator 34 can be controlled by the detonating wire 38 .

[0050] It should be understood that the detonating wire 38 can extend from the closed end of the sleeve 31 to the outside of the sleeve 31, or can extend from the open end of the sleeve 31 out of the sleeve 31 and pass through the anchor rod 21. Figure 7 As shown, in one of the embodiments, the sliding portion 33 is provided with a through hole along the axis of the sleeve 31, and the through hole includes a first fixing hole, a second fixing hole and a third fixing hole which are connected in sequence, the first fixing hole and the third fixing hole are located at both ends of the second fixing hole, and the inner diameters thereof are larger than those of the second fixing hole, and the first fixing hole is located on a side of the second fixing hole close to the detonator 34, one end of the detonating wire 38 is connected to the detonator 34, and the other end passes through the first fixing hole, the second fixing hole, the third fixing hole and the anchor rod 21 in sequence.

[0051] Through the above arrangement, when the sliding part 33 is inserted into the sleeve 31, due to the sealing cooperation between the sliding part 33 and the inner wall of the sleeve 31, a closed cavity is formed between the sliding part 33 and the closed end of the sleeve 31, and air will hinder the sliding of the sliding part 33. In the present embodiment, the sliding part 33 is provided with a through hole, and the gas in the cavity between the sliding part 33 and the closed end of the sleeve 31 can be discharged through the through hole, so that the air can be prevented from hindering the sliding of the sliding part 33. At the same time, before the sliding part 33 is inserted into the sleeve 31, the detonating wire 38 is passed through the sliding part 33 through the through hole, and the detonating wire 38 can pass through the sliding part 33 through the through hole, so that the detonating wire 38 can pass through the inside of the sleeve 31 and the anchor rod 21, so that when the deformation component 3 and the anchor rod 21 are inserted into the anchor hole, during the insertion process of the anchor rod 21 and the deformation component 3, the detonating wire 38 is located in the sleeve 31 and the anchor rod 21, and will not directly contact the inner wall of the anchor hole, so as to avoid the soil layer contacting or being stuck on the inner wall of the anchor hole.

[0052] In order to prevent air or other impurities from entering through the gap between the detonating wire 38 and the through hole to contact the detonator 34, for this purpose, Figure 7 As shown, in one of the embodiments, the deformation component 3 also includes a blocking member 39, which includes a retaining ring 391 and an adhesive layer 392. The retaining ring 391 is fixedly sleeved on the detonating wire 38 and slidably inserted in the first fixing hole. The adhesive layer 392 is built into the gap between the detonating wire 38 and the through hole and connected to the adhesive layer 392.

[0053] In order to block the gap between the detonating wire 38 and the through hole, in this embodiment, after the detonating wire 38 passes through the through hole and the sliding part 33 is inserted into the sleeve 31, glue is injected into the third fixing hole, the glue enters the second fixing hole along the third fixing hole, and flows into the first fixing hole. After the glue is cured, the gap between the detonating wire 38 and the through hole is blocked, and the detonating wire 38 is fixed to the sliding part 33. At the same time, after the glue enters the first fixing hole, it may continue to flow in the direction close to the detonator 34. For this reason, in this embodiment, a retaining ring 391 is provided. The retaining ring 391 is inserted in the first fixing hole to prevent the glue from sliding in the direction close to the detonator 34 and confine the glue in the through hole. At the same time, when the detonator 34 is detonated, the retaining ring 391 can block the first fixing hole to prevent the high-pressure and high-kinetic energy gas formed by the detonation of the detonator 34 from flowing out through the first fixing hole, thereby playing the role of the first layer of blocking, and the glue and the detonating wire 38 can completely block the through hole.

[0054] like Figure 6 As shown, in one embodiment, a fixing hole is opened in the middle of the detonator 34, and the fixing hole penetrates the detonator 34 along the axial direction of the detonator 34.

[0055] By providing the fixing hole, when the detonator 34 is inserted into the closed sleeve 31 , the air in the cavity between the detonator 34 and the closed end of the sleeve 31 can be discharged through the fixing hole, thereby preventing the air from hindering the detonator 34 from sliding into the sleeve 31 .

[0056] The detonator 34 may be an electric detonator, and the explosive in the detonator 34 may be selected in different types and with different contents according to the hardness of the soil layer.

[0057] The present invention also relates to a construction method of a building foundation pit support structure, using the above-mentioned building foundation pit support structure, comprising the following steps: Excavating earth to form a foundation pit; Repair the slope of the foundation pit; Drill holes on the slope of the foundation pit to form anchor holes; Insert the anchor rod 21 and the deformation component 3 into the anchor hole; The supporting layer 1 is attached to the slope of the foundation pit, and the supporting layer 1 is connected to the anchor rod 21; Controlling the detonator 34 to detonate; Pour concrete into the anchor holes.

[0058] The support layer 1 can support and protect the slope of the foundation pit, and the anchor rod 21 can strengthen the connection between the support layer 1 and the soil layer. At the same time, grouting with a certain pressure can make the grouting body penetrate into the anchor holes and gaps of the soil layer, thereby consolidating the soil layer and improving the bearing capacity of the soil layer.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A building foundation pit support structure, characterized in that: include: The supporting layer is in line with the slope of the foundation pit; An anchor assembly, including an anchor rod, wherein a portion of the anchor rod passes through the supporting layer and is embedded in the soil layer of the foundation pit; and The deformation assembly includes a sleeve, at least one baffle, a sliding part, a detonator and a limit piece. The sleeve is threadedly connected to the anchor rod, one end of the baffle is connected to the sleeve, the sliding part is slidably built into the sleeve and connected to the baffle. The detonator is built into the sleeve and can push the sliding part to slide along the axial direction of the sleeve during detonation, so that the sliding part pushes the baffle to rotate in a direction away from the axis of the sleeve. The limit piece is connected to the sleeve and is used to limit the sliding part from resetting after sliding.

2. The building foundation pit support structure according to claim 1 is characterized in that: The sleeve is provided with a first threaded hole in the radial direction; the sliding part is provided with a first annular groove on the peripheral wall; the limiting member includes a stud, a limiting ball and a spring; the stud is threadedly connected to the first threaded hole; the limiting ball is arranged in the first threaded hole and can be embedded in the first threaded hole when the sliding part slides through the first threaded hole; the spring abuts against the limiting ball and the stud to provide elastic force for the limiting ball to be embedded in the first annular groove.

3. The building foundation pit support structure according to claim 1 is characterized in that: The deformation component also includes at least one pushing rod, one end of which is hinged to the sliding part, and the other end of which is hinged to the other end of the blocking bar.

4. The building foundation pit support structure according to claim 2 is characterized in that: The sleeve is provided with at least one strip groove, the strip groove is connected with the interior of the sleeve, the strip groove is arranged along the axial direction of the sleeve, the blocking bar is rotatably arranged in the strip groove; one end of the push rod is slidably arranged in the strip groove.

5. The building foundation pit support structure according to claim 4 is characterized in that: The sliding portion is sealingly matched with the inner wall of the sleeve.

6. The building foundation pit support structure according to claim 1, characterized in that: The deformation component also includes a positioning piece, which is connected to the sleeve and the sliding part; when the detonator is detonated, it can push the sliding part to cut off the positioning piece.

7. The building foundation pit support structure according to claim 6 is characterized in that: The sliding part is provided with a second annular groove; the sleeve is provided with a second threaded hole relative to the second annular groove; the positioning member includes a bolt and a cutting part, the bolt is threadedly connected to the second threaded hole, the cutting part is connected to the bolt and is provided with a cutting groove, and the cutting groove is located between the inner wall of the sleeve and the outer wall of the sliding part.

8. The building foundation pit support structure according to claim 5, characterized in that: The interior of the sleeve is hollow with one end open and the other end closed, and the open end of the sleeve is threadedly connected to the anchor rod; the detonator is built into the closed end of the sleeve, and the sliding part is arranged at one end of the detonator close to the anchor rod, and when the sliding part slides to be limited by the limiting member, the sliding part blocks the communication path between the strip groove and the detonator.

9. The building foundation pit support structure according to claim 1, characterized in that: The deformation component also includes a detonating wire, which is connected to the detonator and extends outside the sleeve.

10. A construction method for a building foundation pit support structure, characterized in that: Using the building foundation pit support structure described in any one of claims 1 to 9 comprises the following steps: Excavating earth to form a foundation pit; Repairing the slope of the foundation pit; Drilling holes on the slope of the foundation pit to form anchor holes; Insert the anchor rod and the deformation assembly into the anchor hole; The support layer is attached to the slope of the foundation pit, and the support layer is connected to the anchor rod; Controlling the detonation of detonators; Pour concrete into the anchor holes.

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