Foundation-pit support structure for garbage storage pit and construction method therefor

Abstract

Disclosed in the present invention are a foundation-pit support structure for a garbage storage pit and a construction method therefor. The support structure comprises: a continuous secant pile arranged around the periphery of a foundation pit, a first capping beam being fixedly provided at the top of the continuous secant pile; a plurality of reinforced concrete cast-in-place piles arranged inside the continuous secant pile and arranged spaced apart in the circumferential direction of the foundation pit, a second capping beam being fixedly provided at the top of the plurality of reinforced concrete cast-in-place piles; a connecting beam arranged between the first capping beam and the second capping beam; a plurality of support beams arranged spaced apart in the direction of height of the foundation pit, each support beam being arranged around the sides of the plurality of reinforced concrete cast-in-place piles that are close to the foundation pit and being fixedly connected to the piles; and a plurality of groups of soil-retaining plates corresponding to the plurality of support beams on a one-to-one basis, each group of soil-retaining plates comprising a plurality of soil-retaining plates arranged spaced apart in the direction of length of the support beams, and each soil-retaining plate being fixedly arranged on the corresponding support beam between two adjacent reinforced concrete cast-in-place piles. The support structure of the present invention has advantages such as high strength and a good support effect.

Description

Garbage storage pit foundation support structure and construction method thereof TECHNICAL FIELD

[0001] The present application relates to the field of foundation pit support. More particularly, the present application relates to a garbage storage pit foundation support structure and construction method thereof. BACKGROUND

[0002] The foundation pit support is a support, reinforcement and protection measure for the side wall and surrounding environment of the foundation pit to ensure the safety of underground structure construction and the surrounding environment of the foundation pit. The existing foundation pit support structure, especially the deep foundation pit, generally adopts a reinforced concrete cast-in-place pile + anchor cable structure. In order to improve the support effect of the foundation pit, there are cases of using double-row piles to support the foundation pit in the prior art. However, due to the certain spacing between the piles, the soil body between the piles, especially the soil body at the lower part of the foundation pit, may still collapse under the action of soil pressure, affecting the construction safety.

[0003] SUMMARY

[0004] An object of the present application is to provide a garbage storage pit foundation support structure and construction method thereof to at least solve the above problems.

[0005] In order to achieve the object and other advantages of the present application, a garbage storage pit foundation support structure is provided, comprising: a continuous interlocking pile, which is arranged around the periphery of the foundation pit, and a first crown beam is fixedly arranged at the top of the continuous interlocking pile; a plurality of reinforced concrete cast-in-place piles, which are arranged on the inner side of the continuous interlocking pile and are spaced apart along the circumference of the foundation pit, and a second crown beam is fixedly arranged at the top of the plurality of reinforced concrete cast-in-place piles; a connecting beam, which is arranged between the first crown beam and the second crown beam and is fixedly connected with the first crown beam and the second crown beam, respectively; a plurality of support beams, which are spaced apart along the height direction of the foundation pit, and each support beam is arranged around and fixedly connected with the side of the plurality of reinforced concrete cast-in-place piles close to the foundation pit; and a plurality of groups of soil retaining plates, which correspond one-to-one to the plurality of support beams, and each group of soil retaining plates comprises a plurality of soil retaining plates spaced apart along the length direction of the support beam, and each soil retaining plate is fixedly arranged between the adjacent two reinforced concrete cast-in-place piles on the corresponding support beam.

[0006] Preferably, the garbage storage pit foundation support structure further comprises a plurality of groups of anchor rods, which correspond one-to-one to the plurality of support beams, and each group of anchor rods comprises a plurality of anchor rods spaced apart along the length direction of the support beam, and one end of each anchor rod is inserted into the soil body through the support beam.

[0007] Preferably, the connecting beam comprises first connecting beams arranged in a head-to-tail manner between the first crown beam and the second crown beam, and second connecting beams respectively arranged at the inner four corners of the first crown beam, and the two ends of the second connecting beam are fixedly connected with the two adjacent first connecting beams respectively.

[0008] Preferably, the retaining plate has a trapezoidal longitudinal section with a narrow upper part and a wide lower part.

[0009] Preferably, the bottom part of the second crown beam and the support beam between the two adjacent reinforced concrete piles is embedded with a U-shaped channel steel with an opening downward, the two side walls of the U-shaped channel steel extend downward to form protruding parts, a plurality of pairs of connecting holes are arranged on the protruding parts along the length direction, and the top part of the U-shaped channel steel is provided with a grouting channel in communication with the outside; the top end of the longitudinal steel embedded in the retaining plate is connected with the U-shaped channel steel through the connecting hole, and the bottom end is connected with the embedded steel protruding from the top part of the support beam.

[0010] Preferably, the depth of the continuous interlocking pile is greater than the depth of the reinforced concrete pile.

[0011] The application further provides a construction method of the garbage storage pit foundation support structure, which is applied to the garbage storage pit foundation support structure and comprises the following steps:

[0012] Step one: constructing the continuous interlocking pile and the reinforced concrete pile according to the design requirements, and reserving connecting steels at the top part of the continuous interlocking pile and the reinforced concrete pile;

[0013] Step two: removing the earth between the continuous interlocking pile and the reinforced concrete pile to expose the connecting steels, binding the first crown beam steel cage and the second crown beam steel cage on the connecting steels, binding the first connecting beam steel cage between the first crown beam steel cage and the second crown beam steel cage, binding the second connecting beam steel cage between the first connecting beam steel cages, supporting the mold, integrally pouring and curing the first crown beam, the second crown beam, the first connecting beam and the second connecting beam to form a whole;

[0014] Step three: layer-by-layer excavating the foundation pit according to the design requirements, and after each layer of excavation, fixing the support beam steel cage on the bottom part of the foundation pit and around the plurality of reinforced concrete piles through the anchor rod, supporting the mold, pouring and curing the support beam to form a whole;

[0015] Step four: arranging the retaining plate steel cage between the adjacent two support beams or between the second crown beam and the adjacent support beam, supporting the mold, pouring and curing the retaining plate to form a whole;

[0016] Step five, repeat step three, step four, until all support beams and retaining wall pouring, and curing forming.

[0017] Preferably, the garbage storage pit foundation support structure construction method, the bottom of the second crown beam reinforcement cage and the support beam reinforcement cage are embedded with downward opening U-shaped channel steel, the upper part of the U-shaped channel steel is provided with a wing plate connected with the corresponding reinforcement cage, and the top of the wing plate is provided with a steel sleeve close to the side of the foundation pit, the outer part of the steel sleeve is coated with a friction-reducing agent, after pouring the second crown beam and the support beam, the lower part of the U-shaped channel steel protrudes from the bottom surface of the second crown beam or the support beam to form a protruding part, after the initial setting of the second crown beam and the support beam, the steel sleeve is taken out to form a grouting channel; the top of the support beam is reserved with a protruding embedded steel bar; the top end of the longitudinal steel bar on the retaining wall reinforcement cage is connected with the protruding part of the U-shaped channel steel, and the bottom end is connected with the embedded steel bar on the support beam.

[0018] The present application at least includes the following beneficial effects:

[0019] The present application sets multiple reinforced concrete piles on the inner side of the continuous interlocking pile along the circumferential direction of the foundation pit, sets multiple support beams on the multiple reinforced concrete piles from top to bottom, sets retaining boards in the grid formed by the multiple reinforced concrete piles and the multiple support beams, and connects the continuous interlocking pile and the multiple reinforced concrete piles through the first crown beam, the second crown beam and the connecting beam to form a whole, which significantly improves the strength of the support structure and the supporting effect on the foundation pit, and effectively avoids the occurrence of foundation pit collapse accidents.

[0020] Other advantages, objects, and features of the application will be better understood from the following description, and will be apparent to those skilled in the art from the teachings of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a top view of the overall structure of the garbage storage pit foundation support structure according to an embodiment of the present application;

[0022] Fig. 2 is a side view of the garbage storage pit foundation support structure according to an embodiment of the present application;

[0023] Fig. 3 is a sectional view of A-A in Fig. 2;

[0024] Fig. 4 is a sectional view of B-B in Fig. 2;

[0025] Fig. 5 is an enlarged view of part C in Fig. 4;

[0026] Fig. 6 is a sectional view of the connection structure of the retaining board and the support beam. DETAILED DESCRIPTION

[0027] The application will be further described in details below with reference to the accompanying drawings and examples, so that those skilled in the art can implement the application according to the description.

[0028] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0029] It should be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial channels unless otherwise specified.

[0030] In the description of the application, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0031] As shown in FIGS. 1-3, the embodiment of the application provides a garbage storage pit foundation support structure, comprising: a continuous interlocking pile 1 which is arranged around the periphery of a foundation pit 2, a first crown beam 3 is fixedly arranged at the top of the continuous interlocking pile 1; a plurality of reinforced concrete piles 4 are arranged on the inner side of the continuous interlocking pile 1 and are arranged circumferentially along the foundation pit 2, a second crown beam 5 is fixedly arranged at the top of the plurality of reinforced concrete piles 4; a connecting beam 6 is arranged between the first crown beam 3 and the second crown beam 5 and is fixedly connected with the first crown beam 3 and the second crown beam 5 respectively; a plurality of support beams 7 are arranged along the height direction of the foundation pit 2, each support beam 7 is arranged around and fixedly connected with the side of the plurality of reinforced concrete piles 4 close to the foundation pit 2; a plurality of groups of soil retaining plates 8 correspond to the plurality of support beams 7 one-to-one, each group of soil retaining plates 8 comprises a plurality of soil retaining plates 8 arranged along the length direction of the support beam 7, and each soil retaining plate 8 is fixedly arranged between the adjacent two reinforced concrete piles 4 on the corresponding support beam 7.

[0032] In the above embodiment, the garbage storage pit foundation support structure includes continuous interlocking piles 1, a plurality of reinforced concrete piles 4, connecting beams 6, a plurality of support beams 7, and a plurality of groups of retaining plates 8. The continuous interlocking piles 1 are arranged along the circumference of the foundation pit 2 outside the periphery of the foundation pit 2 to form a water-blocking structure to prevent water outside the foundation pit 2 from infiltrating into the foundation pit 2, and the top of the continuous interlocking piles 1 is fixedly provided with a first crown beam 3; a plurality of reinforced concrete piles 4 are arranged inside the continuous interlocking piles 1 and along the circumference of the foundation pit 2, the plurality of reinforced concrete piles 4 provide secondary support for the side wall of the foundation pit 2, and the top of the plurality of reinforced concrete piles 4 is fixedly provided with a second crown beam 5; the connecting beams 6 are arranged between and fixedly connected to the first crown beam 3 and the second crown beam 5, and the arrangement of the connecting beams 6, the first crown beam 3 and the second crown beam 5 makes the continuous interlocking piles 1 and the plurality of reinforced concrete piles 4 form an integral whole, thereby enhancing the strength of the support structure and the supporting effect on the foundation pit 2; a plurality of support beams 7 are arranged on the plurality of reinforced concrete piles 4 in the height direction of the foundation pit 2, each support beam 7 is arranged around and fixedly connected to the side of the plurality of reinforced concrete piles 4 close to the foundation pit 2, and the plurality of support beams 7 and the plurality of reinforced concrete piles 4 cooperate to form a grid structure, thereby limiting the vertical displacement of the plurality of reinforced concrete piles 4 and providing installation space for the retaining plates 8; a plurality of groups of retaining plates 8 correspond to the plurality of support beams 7 one-to-one, each group of retaining plates 8 includes a plurality of retaining plates 8 arranged at intervals along the length direction of the support beam 7, each retaining plate 8 is fixedly arranged between the adjacent two reinforced concrete piles 4 on the corresponding support beam 7, i.e., fixedly arranged in the grid formed by the support beam 7 and the reinforced concrete piles 4, and the retaining plates 8, the support beams 7 and the reinforced concrete piles 4 cooperate to form a closed structure for the inner wall of the foundation pit 2, thereby further enhancing the strength of the support structure and the supporting effect on the foundation pit 2.

[0033] The present application significantly improves the strength of the support structure and the supporting effect on the foundation pit by arranging a plurality of reinforced concrete piles at intervals along the circumference of the foundation pit inside the continuous interlocking piles, arranging a plurality of support beams at intervals from top to bottom on the plurality of reinforced concrete piles, arranging retaining plates in the grid formed by the plurality of reinforced concrete piles and the plurality of support beams, and connecting the continuous interlocking piles and the plurality of reinforced concrete piles through the first crown beam, the second crown beam and the connecting beam to form an integral whole, thereby effectively preventing the collapse of the foundation pit.

[0034] In another embodiment, as shown in FIGS. 4 and 5, the garbage storage pit foundation support structure further includes a plurality of groups of anchor rods 9, which correspond to the plurality of support beams 7 one-to-one, each group of anchor rods 9 includes a plurality of anchor rods 9 arranged at intervals along the length direction of the support beam 7, and one end of each anchor rod 9 is inserted into the soil through the support beam 7.

[0035] In the above embodiment, the support beam is fixed to the sidewall of the foundation pit through the anchor rod to further improve the strength of the support structure. Specifically, the distance between adjacent anchor rods is 1.5-2 meters; the bottom of the anchor rod is a pointed end, and the sidewall is provided with an opening. During construction, as shown in FIG. 5, a small hole is first drilled obliquely downward in the soil body of the sidewall of the foundation pit, then the anchor rod is placed in the small hole, the pointed end of the anchor rod is inserted into the soil body, the top is exposed outside the soil body, concrete is injected into the anchor rod, the anchor rod is fixed in the small hole, then the support beam reinforcement cage is hung on the top of the anchor rod, the formwork is set, and the support beam is poured, that is, the support beam is fixed to the sidewall of the foundation pit through the anchor rod, effectively improving the soil pressure resistance of the support beam.

[0036] In another embodiment, as shown in FIG. 1, the connecting beam 6 includes a first connecting beam 61 arranged between the first crown beam 3 and the second crown beam 5 in a head-to-tail manner, and a second connecting beam 62 arranged at the inner four corners of the first crown beam 3, respectively, the two ends of the second connecting beam 62 are fixedly connected with the adjacent two first connecting beams 61, respectively; further, the two ends of the second connecting beam 62 are connected with one end of the adjacent two first connecting beams 61 close to the corner of the first crown beam 3, respectively.

[0037] In the above embodiment, the connecting beam is arranged to include a plurality of first connecting beams connected in a head-to-tail manner and a second connecting beam arranged at the inner four corners of the first crown beam, and the second connecting beam is connected with the first connecting beam, so as to ensure the connecting and supporting capacity of the connecting beam to the first crown beam and the second crown beam, reduce the self-weight of the connecting beam, reduce the lateral pressure of the soil body of the inner wall of the foundation pit, and further improve the supporting effect of the support structure.

[0038] In another embodiment, as shown in FIG. 3 and FIG. 4, the longitudinal section of the soil retaining plate 8 is a trapezoid with a narrow upper part and a wide lower part.

[0039] In the above embodiment, the longitudinal section of the soil retaining plate is arranged as a trapezoid with a narrow upper part and a wide lower part to adapt to the stress change of the soil body and improve the soil pressure resistance of the soil retaining plate.

[0040] In another embodiment, as shown in Figure 5, the part of the bottom of the second crown beam 5 and the support beam 7 located between two adjacent reinforced concrete bored piles 4 is embedded with a U-shaped channel steel 10 with an opening downward, the two side walls of the U-shaped channel steel 10 extend downward to form protrusions, a plurality of pairs of connecting holes are arranged on the protrusions along the length direction of the protrusions, and the top of the U-shaped channel steel 10 is provided with a grouting channel 11 in communication with the outside; wherein the top end of the longitudinal steel bars 12 embedded in the retaining board 8 is connected with the U-shaped channel steel 10 through the connecting holes, and the bottom end is connected with the embedded steel bars protruding from the top of the support beam 7. Specifically, the connection mode of the longitudinal steel bars 12 and the connecting holes can be that the top end of the longitudinal steel bars 12 is respectively bent towards the connecting holes, so that the top end of the connecting steel bars 12 is inserted into the corresponding connecting holes, that is, the bent longitudinal steel bars 12 are hung in the U-shaped channel steel 10 through the connecting holes, or that a connecting sleeve is pre-welded on the longitudinal steel bars 12, the inner diameter of the connecting sleeve is not less than the inner diameter of the connecting hole, then the connecting sleeve is opposite to the corresponding connecting hole, and then a steel bar with a diameter not greater than the inner diameter of the connecting hole is inserted into the corresponding connecting hole and the connecting sleeve, so that the longitudinal steel bars 12 are hung in the U-shaped channel steel 10.

[0041] In the above embodiment, the U-shaped channel steel is embedded at the bottom of the second crown beam and the support beam, a plurality of pairs of connecting holes are arranged on the protrusions of the U-shaped channel steel, a grouting channel in communication with the outside is arranged at the top of the U-shaped channel steel, the longitudinal steel bars of the retaining board are hung in the U-shaped channel steel through the connecting holes, and the grouting channel is used for pouring concrete into the U-shaped channel steel, so that after the concrete is poured, the top of the retaining board is integrated with the second crown beam and the support beam, and the soil pressure resistance of the retaining board is further improved.

[0042] Further, the top of the support beam 7 is reserved with embedded steel bars protruding, and the bottom end of the longitudinal steel bars 12 is fixed with the embedded steel bars by binding, so that after the concrete is poured, the bottom of the retaining board is also integrated with the support beam.

[0043] In another embodiment, as shown in Figures 2 and 3, the depth of the continuous interlocking pile 1 is greater than the depth of the reinforced concrete bored pile 4, so as to improve the water resistance of the supporting structure and prevent seepage of the foundation pit.

[0044] The application also provides a construction method of the supporting structure of the garbage storage pit foundation pit, which is applied in the supporting structure of the garbage storage pit foundation pit, and comprises the following steps:

[0045] Step one, the continuous interlocking pile 1 and the reinforced concrete bored pile 4 are constructed according to the design requirements, and the top of the continuous interlocking pile 1 and the reinforced concrete bored pile 4 is reserved with connecting steel bars;

[0046] Step two, the earth between the continuous bite pile 1 and the reinforced concrete bored pile 4 is dug away, the connecting steel is exposed, the first crown beam steel cage and the second crown beam steel cage are tied on the connecting steel, the first connecting beam steel cage is tied between the first crown beam steel cage and the second crown beam steel cage, the second connecting beam steel cage is tied between the first connecting beam steel cage, the formwork is supported, the first crown beam 3, the second crown beam 5, the first connecting beam 61 and the second connecting beam 62 are integrally poured and cured to form;

[0047] Step three, the foundation pit 2 is excavated according to the design requirements, after each layer of excavation is completed, the support beam steel cage is fixed on the bottom of the foundation pit 2 and is surrounded on the plurality of reinforced concrete bored piles 4 through the anchor rod 9, the formwork is supported, the support beam 7 is poured and cured to form;

[0048] Step four, the soil retaining plate steel cage is erected between the adjacent two support beams 7 or between the second crown beam 5 and the adjacent support beam 7, the formwork is supported, the soil retaining plate 8 is poured and cured to form;

[0049] Step five, steps three and four are repeated until all the support beams 7 and the soil retaining plates 8 are poured and cured to form.

[0050] Further, the bottom of the second crown beam steel cage and the support beam steel cage is embedded with a U-shaped channel steel 10 with an opening downward, the upper two sides of the U-shaped channel steel 10 are provided with wing plates 13 connected with the corresponding steel cages, the top side close to the foundation pit is provided with a steel sleeve, the outside of the steel sleeve is coated with a friction-reducing agent, after the second crown beam 5 and the support beam 7 are poured, the lower part of the U-shaped channel steel 10 protrudes from the bottom surface of the second crown beam 5 or the support beam 7 to form a protruding part, after the second crown beam 5 and the support beam 7 are initially cured, the steel sleeve is removed to form a grouting channel 11; the top end of the longitudinal steel 12 on the soil retaining plate steel cage is connected with the protruding part of the U-shaped channel steel 10, and the bottom end is connected with the embedded steel on the support beam.

[0051] The number of devices and the scale of processing described herein are used to simplify the description of the present application. It is obvious for those skilled in the art that the application of the garbage storage pit foundation pit support structure and the construction method thereof can be modified and changed.

[0052] Although the embodiments of the present application have been disclosed as above, they are not limited to the application and the implementation listed in the specification, and can be fully applied to various fields suitable for the present application, and other modifications can be easily realized by those skilled in the art, therefore, the present application is not limited to the specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A foundation support structure for a waste storage pit, characterised in that, Comprise: Continuous bite pile, which is arranged in the periphery of the foundation pit, the top of the continuous bite pile is fixedly provided with a first crown beam; A plurality of reinforced concrete piles are arranged inside the continuous bite pile and are arranged in a circumferential direction of the foundation pit, the top of the plurality of reinforced concrete piles is fixedly provided with a second crown beam; A connecting beam is arranged between the first crown beam and the second crown beam and is fixedly connected with the first crown beam and the second crown beam respectively; A plurality of support beams are arranged in a height direction of the foundation pit, each support beam is arranged around and fixedly connected with the plurality of reinforced concrete piles on a side close to the foundation pit; A plurality of groups of retaining plates correspond to the plurality of support beams, each group of retaining plates comprises a plurality of retaining plates arranged in a length direction of the support beam, and each retaining plate is fixedly arranged between two adjacent reinforced concrete piles on the corresponding support beam.

2. The refuse holding pit excavation support structure of claim 1, wherein, Further comprising a plurality of groups of anchor rods corresponding to the plurality of support beams, each group of anchor rods comprises a plurality of anchor rods arranged in a length direction of the support beam, and one end of each anchor rod is inserted into the soil through the support beam.

3. A refuse storage pit excavation support structure according to claim 2, wherein, The connecting beam comprises a first connecting beam arranged between the first crown beam and the second crown beam in a head-to-tail manner, and a second connecting beam arranged at four corners of the inside of the first crown beam respectively, and two ends of the second connecting beam are fixedly connected with two adjacent first connecting beams respectively.

4. A waste bunker pit support structure according to claim 3, wherein The longitudinal section of the retaining plate is a trapezoid with a narrow upper part and a wide lower part.

5. A refuse storage pit excavation support structure according to claim 4, wherein, The bottom part of the second crown beam and the support beam is embedded with a U-shaped channel steel with an opening downward, the two side walls of the U-shaped channel steel extend downward to form protruding parts, a plurality of pairs of connecting holes are arranged in a length direction of the protruding parts, and a grouting channel in communication with the outside is arranged at the top of the U-shaped channel steel; wherein the top end of the longitudinal reinforcement arranged in the retaining plate is connected with the U-shaped channel steel through the connecting hole, and the bottom end is connected with the embedded reinforcement protruding from the top of the support beam.

6. A refuse storage pit excavation support structure according to claim 5, wherein, The depth of the continuous bite pile is greater than the depth of the reinforced concrete pile.

7. A construction method of a foundation support structure for a waste storage pit, characterized by, The application is applied to the waste storage pit foundation pit supporting structure as claimed in claim 6, comprising: Step one, constructing the continuous bite pile and the reinforced concrete pile according to the design requirements, and reserving connecting steel bars at the top of the continuous bite pile and the reinforced concrete pile; Step two, removing the soil between the continuous bite pile and the reinforced concrete pile to expose the connecting steel bars, binding the first crown beam reinforcement cage and the second crown beam reinforcement cage on the connecting steel bars, binding the first connecting beam reinforcement cage between the first crown beam reinforcement cage and the second crown beam reinforcement cage, binding the second connecting beam reinforcement cage between the first connecting beam reinforcement cage, supporting the mold, and integrally pouring and curing the first crown beam, the second crown beam, the first connecting beam and the second connecting beam to form; Step three, layering excavating the foundation pit according to the design requirements, after each layer is excavated, the support beam reinforcement cage is fixedly arranged on the bottom of the foundation pit and around the plurality of reinforced concrete piles through the anchor rod, the mold is supported, the support beam is poured and cured to form. Step four, erecting the retaining board reinforcement cage between the adjacent two support beams or the second crown beam and the adjacent support beam, supporting the mold, pouring the retaining board, and curing the molding; Step five, repeating step three and step four until all the support beams and retaining boards are poured and cured.

8. The construction method of a foundation pit support structure for a refuse storage pit according to Claim 7, wherein The bottom of the second crown beam reinforcement cage and the support beam reinforcement cage are both embedded with a U-shaped channel steel with an opening downward, the two sides of the upper part of the U-shaped channel steel are provided with a wing plate connected with the corresponding reinforcement cage, and the side close to the foundation pit on the top is provided with a steel sleeve, the outside of the steel sleeve is coated with a friction-reducing agent, after the pouring of the second crown beam and the support beam, the lower part of the U-shaped channel steel protrudes from the bottom surface of the second crown beam or the support beam to form a protruding part, after the initial setting of the second crown beam and the support beam, the steel sleeve is removed to form a grouting channel; the top of the support beam is reserved with a protruding embedded steel bar; the top end of the longitudinal steel bar on the retaining board reinforcement cage is connected with the protruding part of the U-shaped channel steel, and the bottom end is connected with the embedded steel bar on the support beam.

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