Assembled foundation pit supporting beam segment convenient to disassemble and prefabrication method thereof

Abstract

The present application belongs to the field of building engineering, and designs an assembled reinforced concrete foundation pit support beam section convenient to remove and a prefabrication method thereof; the present application pre-fabricates a standardized reinforced concrete foundation pit support beam section before excavation of a foundation pit, and forms a hole for connection of the beam section by pre-burial during pre-fabrication; the foundation pit support beam section can be assembled into a support system on site of the foundation pit; after the support mission is completed, the support system is removed, and the foundation pit support beam section is recycled for use in new foundation pit support in the future; the present application changes the traditional one-time use cast-in-place reinforced concrete inner support beam of a foundation pit into an assembled foundation pit support beam section that can be used repeatedly, thereby not only saving construction time but also enabling repeated recycling and utilization, which is a successful implementation of the green building concept in the field of foundation pit support; the present application not only saves the cost of foundation pit support, but also simplifies the work of removing the foundation pit support, and has good economic and social benefits.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building engineering, in particular to an assembly type reinforced concrete foundation pit support beam segment convenient to demolish and a prefabrication method thereof. BACKGROUND

[0002] In a foundation pit project, the foundation pit support beam can effectively support the surrounding soil, form a stable support system, and ensure the stability of the foundation pit, playing a very important role in the foundation pit excavation.

[0003] In a large ground stress situation, cast-in-place reinforced concrete internal support is a relatively optimal choice. It has the advantages of flexible design, good integrity, high pressure resistance, and high reliability. However, it also has the disadvantages of long construction period, difficult demolition, difficult recycling, short service life, and high cost.

[0004] In order to overcome the shortcomings of cast-in-place concrete support, assembly type reinforced concrete support is used in foundation pits with large ground stress and square shape, which can take advantage of the assembly type support beam, which is convenient to demolish and install, can be recycled and reused, and can shorten the construction period. SUMMARY

[0005] The present application aims to solve the problems existing in the current foundation pit support system, and provides an assembly type foundation pit support beam segment convenient to demolish and a prefabrication method thereof, achieving the purpose of safe, efficient, fast, low-cost, and recyclable foundation pit support.

[0006] To solve the above problems, the present application adopts the following scheme:

[0007] The assembly type foundation pit support beam segment convenient to demolish comprises a cuboid reinforced concrete, a beam sleeve, a longitudinal embedded pipe and a transverse embedded pipe. The beam sleeve is sleeved on the cuboid reinforced concrete. The beam sleeve comprises an end face steel plate, an angle steel, a side face steel plate, a top face steel plate and a bottom face steel plate. The end face steel plate is provided with a first hole, and the side face steel plate is provided with a second hole. One end of the longitudinal embedded pipe is welded to the inner wall of the first hole to form a longitudinal reinforcing bar hole, and the other end of the longitudinal embedded pipe is deep into the cuboid reinforced concrete and parallel to the angle steel. The two ends of the transverse embedded pipe are welded to the hole walls of the second holes on the two side face steel plates to form transverse reinforcing bar holes, and the transverse embedded pipe is perpendicular to the angle steel. The longitudinal embedded pipe and the transverse embedded pipe do not intersect.

[0008] Preferably, the longitudinal reinforcing bar hole and the transverse reinforcing bar hole have the same hole diameter.

[0009] Preferably, the vertical spacing of adjacent longitudinal reinforcing bar holes or transverse reinforcing bar holes is the same, and the distance between the uppermost longitudinal reinforcing bar hole and the upper edge of the beam sleeve is equal to the distance between the lowermost transverse reinforcing bar hole and the lower edge of the beam sleeve.

[0010] Preferably, the longitudinal reinforcing bar holes are two rows and the transverse reinforcing bar holes are one row; the distance between the two rows of longitudinal reinforcing bar holes is equal to twice the distance between the transverse reinforcing bar holes and the end face steel plate.

[0011] Preferably, the longitudinal embedded pipe is a steel pipe with a threaded outer side and a smooth inner side, the steel pipe is sealed at one end of the cuboid reinforced concrete and is open at the other end; the transverse embedded pipe is a steel pipe with a threaded outer side and a smooth inner side, the steel pipe is open at both ends.

[0012] Preferably, a clasp is welded on the side steel plate of the beam sleeve, and the clasps are uniformly arranged on the side steel plate.

[0013] The prefabrication method of the assembled foundation pit support beam section convenient for disassembly comprises the following steps:

[0014] 1) Clean up the remaining concrete residues in the mold placement area, clean up the joint of the side mold and the end mold, and clean up the joint of the side mold and the end mold and the bottom mold;

[0015] 2) Weld the beam sleeve, weld the side steel plate and the bottom steel plate on the frame formed by welding four angle steels and two end face steel plates;

[0016] 3) Insert the transverse embedded pipe into the second hole and weld and fix it, and insert the longitudinal embedded pipe into the first hole and weld and fix it;

[0017] 4) Connect the transverse embedded pipe and the longitudinal embedded pipe with vertical steel bars, and weld and fix the vertical steel bars at the contact positions of the transverse embedded pipe and the longitudinal embedded pipe;

[0018] 5) Steel bar binding;

[0019] 6) After the steel bar binding is completed, weld the top steel plate to form a beam sleeve;

[0020] 7) Apply water-based release agent on the bottom mold;

[0021] 8) Place the welded beam sleeve on the bottom mold;

[0022] 9) After applying water-based release agent on the side mold and the end mold, install them, and ensure that the side mold and the end mold are completely attached to the beam sleeve during installation;

[0023] 10) Pour concrete into the mold, seal the ends of the longitudinal embedded pipe and the transverse embedded pipe with gypsum before pouring, ensure that the longitudinal embedded pipe and the transverse embedded pipe do not shift before pouring, and vibrate the vibrator until no air bubbles are generated after pouring is completed;

[0024] 11) After the cuboid reinforced concrete forms strength, demold and maintain, and after maintenance is completed, demold;

[0025] 12) After the demoulding is completed, the excess concrete on the surface of the beam sleeve is removed, the longitudinal embedded pipe and the transverse embedded pipe sealing gypsum are removed, and a protective layer is coated on the surface of the concrete, and the beam sleeve surface and the inner wall of the longitudinal embedded pipe and the transverse embedded pipe are brushed with anti-rust paint.

[0026] Advantages of the present application:

[0027] 1. The prefabricated foundation pit support beam segment of the present application is convenient to disassemble, and the cast-in-situ reinforced concrete support beam operation of the foundation pit is transferred to the factory or outside the field for advance prefabrication, realizing the assembly construction of the support in the foundation pit, shortening the construction period of the support in the foundation pit, and accelerating the progress of the entire project.

[0028] 2. The reinforced concrete beam segment provided by the present application has a standardized size and structure, which not only simplifies the prefabrication (only a few templates are needed, and the prefabrication process is also easy to standardize), but also is beneficial to transportation, disassembly and reuse, greatly reducing the cost. The standardization can be realized in one foundation pit, or in a larger range, such as a district of a city, a county, a province, or even the whole country, achieving greater social and economic benefits.

[0029] 3. The reinforcing bar connecting method of the prefabricated foundation pit support beam segment provided by the present application can completely recycle the foundation pit support beam segment after use, and the foundation pit support beam segment can be reused, greatly reducing the cost of the support in the foundation pit, and also significantly reducing carbon emissions compared with the traditional cast-in-situ reinforced concrete support beam.

[0030] 4. The present application provides a beam sleeve, which is wrapped around the cuboid reinforced concrete, effectively protecting the cuboid reinforced concrete body (especially protecting the beam end opening part to avoid structural weakening); the increased steel consumption can be offset by reducing the reinforcement ratio of the foundation pit support beam segment, without significantly increasing the support cost; the beam sleeve protects the shape integrity of the support beam, reduces the damage probability of the foundation pit support beam segment during use, prolongs the service life of the foundation pit support beam segment, improves the number of cycles of the foundation pit support beam segment, and reduces the cost of single foundation pit support.

[0031] 5. The present application coats anti-rust paint on the surface of the beam sleeve and a protective layer on the surface of the concrete when prefabricating the foundation pit support beam segment, effectively protecting the beam sleeve and the concrete part on the surface of the foundation pit support beam segment, preventing erosion, improving the service life of the foundation pit support beam segment, and reducing the single cost of the support in the foundation pit.

[0032] 6. The prefabricated foundation pit support beam provided by the present application has a simple connection method, which is very suitable for occasions where the shape is square and the inner support only bears axial force. This connection method of the prefabricated support beam is also very easy to disassemble, greatly simplifying the disassembly work and reducing the disassembly cost. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The overall structure diagram of the assembled foundation pit support beam section convenient for disassembly;

[0034] Figure 2 The beam sleeve and part of the reinforcing steel of the assembled foundation pit support beam section convenient for disassembly;

[0035] Figure 3 The beam sleeve of the assembled foundation pit support beam section convenient for disassembly;

[0036] Figure 4 The overall structure diagram of the welded buckle of the assembled foundation pit support beam section convenient for disassembly;

[0037] Figure 5 The axial connection structure diagram of two beams of the assembled foundation pit support beam section convenient for disassembly;

[0038] Figure 6 The axial connection structure diagram of the welded buckle of two beams of the assembled foundation pit support beam section convenient for disassembly;

[0039] Figure 7 The cross connection structure diagram of four beams of the assembled foundation pit support beam section convenient for disassembly;

[0040] Figure 8 The formwork in the prefabrication method of the assembled foundation pit support beam section convenient for disassembly.

[0041] In the figure: 1, cuboid reinforced concrete; 2, beam sleeve; 201, end face steel plate; 202, angle steel; 203, side face steel plate; 204, top face steel plate; 205, bottom face steel plate; 206-1, first hole; 206-2, second hole; 207, longitudinal insert hole; 208, transverse insert hole; 209, buckle; 3, longitudinal pre-buried pipe; 4, transverse pre-buried pipe; 5, connecting reinforcing steel; 6, longitudinal reinforcing steel; 7, vertical reinforcing steel; 8, connecting steel plate; 9, bottom mold; 10, side mold; 11, end mold. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0043] The application discloses an assembly type foundation pit supporting beam segment convenient to disassemble, which comprises a cuboid reinforced concrete 1, a beam sleeve 2, a longitudinal embedded pipe 3 and a transverse embedded pipe 4, the beam sleeve 2 is sleeved on the cuboid reinforced concrete 1, and the beam sleeve 2 comprises end face steel plates 201, angle steels 202, side face steel plates 203, top face steel plates 204 and bottom face steel plates 205; the end face steel plates 201 are provided with first holes 206-1, and the side face steel plates 203 are provided with second holes 206-2; one end of the longitudinal embedded pipe 3 is welded to the inner wall of the first hole 206-1 to form a longitudinal reinforcing bar hole 207, and the other end of the longitudinal embedded pipe 3 penetrates into the cuboid reinforced concrete 1 and is parallel to the angle steel 202; the transverse embedded pipe 4 is welded to the hole walls of the second holes 206-2 on the two side face steel plates 203 to form a transverse reinforcing bar hole 208, and the transverse embedded pipe 4 is perpendicular to the angle steel 202; the longitudinal embedded pipe 3 and the transverse embedded pipe 4 do not intersect.

[0044] The longitudinal reinforcing bar hole 207 and the transverse reinforcing bar hole 208 have the same hole diameter.

[0045] The vertical spacing of adjacent longitudinal reinforcing bar holes 207 or transverse reinforcing bar holes 208 is the same, the distance between the uppermost longitudinal reinforcing bar hole 207 and the upper edge of the beam sleeve 2 is equal to the distance between the lowermost transverse reinforcing bar hole 208 and the lower edge of the beam sleeve 2.

[0046] The longitudinal reinforcing bar holes 207 are two rows, and the transverse reinforcing bar hole 208 is one row; the distance between the two rows of longitudinal reinforcing bar holes 207 is equal to twice the distance between the transverse reinforcing bar hole 208 and the end face steel plate 201.

[0047] When the transverse reinforcing bar hole 208 and the longitudinal reinforcing bar hole 207 are spliced in the foundation pit supporting beam segment, the connecting steel bars 5 are inserted into the transverse reinforcing bar hole 208 and the longitudinal reinforcing bar hole 207.

[0048] The longitudinal embedded pipe 3 is a steel pipe with threads on the outer side and smooth on the inner side, one end of the steel pipe is sealed and the other end is opened; the transverse embedded pipe 4 is a steel pipe with threads on the outer side and smooth on the inner side, and the two ends of the steel pipe are opened.

[0049] The side face steel plate 203 of the beam sleeve 2 is additionally welded with a clasp 209, and the clasps 209 are uniformly arranged on the side face steel plate 203.

[0050] A prefabrication method of the assembly type foundation pit supporting beam segment convenient to disassemble, comprising the following steps:

[0051] 1) cleaning the remaining concrete residues in the mold placement area, cleaning the joint of the side mold 10 and the end mold 11, and cleaning the joint of the side mold 10 and the end mold 11 and the bottom mold 9;

[0052] 2) welding the beam sleeve 2, welding four angle steels 202 and two end face steel plates 201 into a frame, and welding side face steel plates 203 and bottom face steel plates 205 on the frame;

[0053] 3) The transverse embedded pipe 4 is inserted into the second hole 206-2 and welded, and the longitudinal embedded pipe 3 is inserted into the first hole 206-1 and welded;

[0054] 4) The transverse embedded pipe 4 and the longitudinal embedded pipe 3 are connected by the vertical reinforcement 7, and the vertical reinforcement 7 is welded at the contact position with the transverse embedded pipe 4 and the longitudinal embedded pipe 3;

[0055] 5) Reinforcement binding, the longitudinal reinforcement 6 is bound at the end of the longitudinal embedded pipe 3;

[0056] 6) After the reinforcement binding is completed, the top steel plate 204 is welded to form the beam sleeve 2;

[0057] 7) The water-based release agent is applied on the bottom mold 9;

[0058] 8) The welded beam sleeve 2 is placed on the bottom mold 9;

[0059] 9) The side mold 10 and the end mold 11 are installed after the water-based release agent is applied, and the side mold 10 and the end mold 11 should be completely attached to the beam sleeve 2 during installation;

[0060] 10) The concrete is poured into the mold, the longitudinal embedded pipe 3 and the transverse embedded pipe 4 are sealed by gypsum before pouring, the longitudinal embedded pipe 3 and the transverse embedded pipe 4 are ensured not to be deviated before pouring, and the vibrating rod is vibrated until no bubbles are generated after pouring is completed;

[0061] 11) After the cuboid reinforced concrete 1 forms strength, the mold is removed and maintained, and the mold is removed after maintenance is completed;

[0062] 12) After the mold is removed, the excess concrete on the surface of the beam sleeve 2 is removed, the sealing gypsum of the longitudinal embedded pipe 3 and the transverse embedded pipe 4 is removed, a protective layer is coated on the surface of the concrete, and anti-rust paint is brushed on the surface of the beam sleeve 2 and the inner wall of the longitudinal embedded pipe 3 and the transverse embedded pipe 4.

[0063] As Figure 1 , Figure 2 and Figure 3As shown, the overall structure diagram of the assembled foundation pit support beam section convenient to disassemble, the beam sleeve and part of the reinforcement diagram of the assembled foundation pit support beam section convenient to disassemble, and the beam sleeve diagram of the assembled foundation pit support beam section convenient to disassemble, the beam sleeve 2 wraps the cuboid reinforced concrete 1, wherein the beam sleeve is formed by welding the end face steel plate 201, the angle steel 202, the side face steel plate 203, the top face steel plate 204 and the bottom face steel plate 205, the two end head structures of the beam sleeve 2 are the same, the end head is formed by welding one Q390 rectangular end face steel plate 201 with a length x height of 1 m x 0.8 m and a thickness of 2 cm, two Q390 rectangular side face steel plates 203 with a length x width of 0.6 m x 0.5 m and a thickness of 1 cm, one Q390 rectangular top face steel plate 204 with a length x width of 0.8 m x 0.5 m and a thickness of 1 cm, and one Q390 rectangular bottom face steel plate 205 with a length x width of 0.8 m x 0.5 m and a thickness of 1 cm, and the two end heads are connected by welding four L100x10 angle steels with a length of 4.96 m. Six first holes 206-1 are arranged on the end face steel plate 201, and three second holes 206-2 are arranged on the side face steel plate 203, the hole diameters of the first holes 206-1 and the second holes 206-2 are the same, both are 40 mm, the vertical spacing of adjacent longitudinal reinforcement insertion holes 207 or transverse reinforcement insertion holes 208 is the same, the vertical spacing is 20 cm, the distance between the uppermost longitudinal reinforcement insertion hole 207 and the upper edge is the same as the distance between the lowermost transverse reinforcement insertion hole 208 and the lower edge, both are 25 cm, and the first holes 206-1 and the second holes 206-2 at both ends of the beam sleeve 2 are arranged the same. The longitudinal embedded pipe 3 is a stainless steel pipe with a length of 1 m, an outer diameter of 40 mm and an inner diameter of 36 mm, and is longitudinally embedded at both ends of the cuboid reinforced concrete 1 along the beam axis, six longitudinal embedded pipes 3 are embedded at each end head, one end of the longitudinal embedded pipe 3 is open and located on the end face steel plate 201 of the beam sleeve 2 and coincides with the first hole 206-1, and the other end of the longitudinal embedded pipe 3 is sealed, and the sealing section is located in the cuboid reinforced concrete 1. The transverse embedded pipe 4 is a stainless steel pipe with a length of 1 m, an outer diameter of 40 mm and an inner diameter of 36 mm, and is vertically embedded at both ends of the cuboid reinforced concrete 1, three transverse embedded pipes 4 are embedded at each end head, both ends of the transverse embedded pipe 4 are open and located on the side face steel plate 203 of the beam sleeve 2 and coincide with the second holes 206-2 on the side face steel plate 203, and the longitudinal embedded pipe 3 and the transverse embedded pipe 4 are arranged alternately.

[0064] As Figure 4The figure shows the overall structure of the welded buckle of the prefabricated foundation pit support beam section for easy dismantling. Buckles 209 are welded on the sides of the beam sleeve 2 at both ends. The buckles 209 are evenly arranged in the vertical space on the side of the beam sleeve 2. The buckles are hollow rectangular steel components. The cross-sectional height of each buckle is 20 cm, the width is 4 cm, and the length is 20 cm. The height of the internal hollow part is 18 cm, the width is 2 cm, and the length is 20 cm.

[0065] like Figure 5 、 Figure 6 The figure shows a schematic diagram of the axial connection structure of two prefabricated foundation pit support beam segments for easy removal, and a schematic diagram of the axial connection structure of two prefabricated foundation pit support beam segments for easy removal with welded buckles. The two foundation pit support beam segments are connected by connecting steel bars 5 with a diameter of 36 mm. The connecting steel bars 5 are first inserted into the longitudinal embedded pipes 3 of the foundation pit support beam segments. Another foundation pit support beam segment is then hoisted and docked. The two foundation pit support beam segments are docked, and the above operation is repeated to complete the axial connection of multiple foundation pit support beam segments. Buckles 209 are welded to the side of the beam sleeve 2. After the foundation pit support beam segments are axially connected using the connecting steel bars 5, they are connected using connecting steel plates 8 with a length of 60 cm, a height of 18 cm, and a width of 2 cm. The connecting steel plates 8 are inserted into the buckles 209 at the ends of the two foundation pit support beam segments.

[0066] like Figure 7 The figure shows a schematic diagram of the four-beam cross connection structure of the prefabricated foundation pit support beam segment that is easy to dismantle. After the axial connection of the foundation pit support beam segment is completed, the transverse embedded pipe 4 at the axial connection node of the foundation pit support beam segment is inserted into the connecting steel bar 5 with a diameter of 36 mm, and the longitudinal embedded pipe 3 of the foundation pit support beam segment is connected to the connecting steel bar 5 to complete the cross connection.

[0067] like Figure 8 As shown, the prefabricated mold of the foundation pit support beam section is formed by splicing a bottom mold 9, two side molds 10, and two end molds 11. The connection is fixed and locked by bolts, so that the bottom mold 9, side molds 10, and end molds 11 are tightly fixed together.

[0068] The longitudinal embedded pipe 3 and the transverse embedded pipe 4 are both steel pipes with smooth inner sides and threads on the outer sides.

[0069] The buckle loop 209 is rectangular in shape, and the connecting steel plate 8 is a steel plate.

[0070] The transverse embedded pipe 4 is of the same model as the longitudinal embedded pipe 3 , and has the same outer diameter and hole diameter as that of the longitudinal embedded pipe 3 .

[0071] The surface of the beam sleeve of the prefabricated supporting beam is coated with anti-rust paint, and the surface of the concrete is coated with a protective layer.

[0072] Example 1

[0073] A foundation pit, the outer package size of the diaphragm wall is 69 m x 60 m, the inner support adopts the orthogonal counter support arrangement form, 4 layers of inner support are designed in the foundation pit, the cross section width of the support beam section of the foundation pit is 1000 mm, the cross section height is 800 mm, and the length of the support beam section of the foundation pit is 4000 mm.

[0074] The concrete residues remaining in the mold placement area are cleaned, the splicing positions of the side mold 10 and the end mold 11 and the splicing positions of the side mold 10 and the end mold 11 and the bottom mold 9 are cleaned;

[0075] The beam sleeve is welded into a frame by four long 4 m L100x10 angle steels 202 and two Q390 end face steel plates 201 with a length of 1 m, a width of 0.8 m and a thickness of 20 mm. The end face steel plate 201 is provided with six first holes 206-1 according to the design and is arranged in two columns and three rows. One column has three first holes 206-1, and the first holes 206-1 in the two columns are symmetrically arranged along the central axis of the end face steel plate 201. The vertical distance between the adjacent holes in one column of first holes 206-1 is 200 mm. The center of the uppermost first hole 206-1 in one column of first holes 206-1 is 150 mm away from the upper edge of the end face steel plate 201 and 650 mm away from the lower edge of the end face steel plate 201. One row has two first holes 206-1, and the center of the first hole 206-1 is 800 mm apart horizontally. The first holes 206-1 on the end face steel plate 201 have a diameter of 40 mm. Four Q390 side face steel plates 203 with a length of 0.5 m, a width of 0.6 m and a thickness of 10 mm are welded on the frame. Each side face steel plate 203 is provided with three second holes 206-2 according to the design. The three second holes 206-2 are arranged in a column. The vertical distance between the adjacent second holes 206-2 is 200 mm. The uppermost second hole 206-2 is 50 mm away from the upper edge of the side face steel plate 203 and 550 mm away from the lower edge. The left side edge is 380 mm away, and the right side edge is 120 mm away. The second holes 206-2 on the side face steel plate 203 have a diameter of 40 mm. A bottom face steel plate 205 with a length of 0.5 m, a width of 0.8 m and a thickness of 10 mm is welded.

[0076] The two ends of the foundation pit support beam section are provided with three transverse embedded pipes 4, the transverse embedded pipes 4 are stainless steel pipes with an outer diameter of 40 mm, an inner diameter of 36 mm and a length of 1 m, the two ends of the transverse embedded pipes 4 are open, the transverse embedded pipes 4 are inserted into the second hole 206-2, and the transverse embedded pipes 4 are welded and fixed with the side steel plate 203; the two ends of the foundation pit support beam section are provided with six longitudinal embedded pipes 3, the longitudinal embedded pipes 3 are stainless steel pipes with an outer diameter of 40 mm, an inner diameter of 36 mm and a length of 1 m, one end of the longitudinal embedded pipes 3 is open and the other end is sealed, the sealed end is located on the inner side, the open end of the longitudinal embedded pipes 3 is inserted into the first hole 206-1, and the longitudinal embedded pipes 3 are welded and fixed with the end face steel plate 201;

[0077] Two 18 mm HRB400 vertical steel bars 7 with a length of 600 mm are used to connect the transverse embedded pipes 4 and the longitudinal embedded pipes 3, and the vertical steel bars 7 are welded and fixed at the contact positions of the transverse embedded pipes 4 and the longitudinal embedded pipes 3;

[0078] The longitudinal reinforcement is made of 18 mm HRB400, and the stirrup is made of 10 mm HRB336, the steel bars are bound according to the design, and part of the longitudinal steel bars 6 are bound on the longitudinal embedded pipes 3 at the end portions;

[0079] After the steel bar binding is completed, the top steel plate 204 is welded, the top steel plate 204 has a length of 0.5 m, a width of 0.8 m and a thickness of 10 mm, and a beam sleeve 2 is formed;

[0080] Water-based release agent is applied on the bottom mold 9;

[0081] The welded beam sleeve 2 is placed on the bottom mold 9;

[0082] After the water-based release agent is applied on the side mold 10 and the end mold 11, the side mold 10 and the end mold 11 are installed, and the side mold 10 and the end mold 11 should be completely attached to the beam sleeve 2 during installation;

[0083] The concrete is poured into the mold, the end of the longitudinal embedded pipe 3 and the transverse embedded pipe 4 is sealed with gypsum during pouring, the longitudinal embedded pipe 3 and the transverse embedded pipe 4 should not be deviated during pouring, and the vibrating rod is vibrated after pouring until no air bubbles are generated;

[0084] After the rectangular steel reinforced concrete 1 forms strength, the mold is removed and maintained, and the mold is removed after the maintenance is completed;

[0085] After the mold removal is completed, the excess concrete on the surface of the beam sleeve 2 is removed, the gypsum sealing the longitudinal embedded pipe 3 and the transverse embedded pipe 4 is removed, a protective layer is applied on the surface of the concrete, and anti-rust paint is brushed on the surface of the beam sleeve 2 and the inner wall of the longitudinal embedded pipe 3 and the transverse embedded pipe 4.

[0086] Example 2

[0087] In a subway foundation pit engineering, seven supports are used to maintain the stability of the underground continuous wall. The cross-sectional width of the foundation pit support beam section is designed to be 800 mm, the cross-sectional height is designed to be 800 mm, and the length of the foundation pit support beam section is designed to be 4000 mm.

[0088] Clean up the remaining concrete residues in the mold placement area, clean up the joint between the side mold 10 and the end mold 11, and the joint between the side mold 10 and the end mold 11 and the bottom mold 9;

[0089] The beam sleeve 2 is welded into a frame by four long 4 m L100x10 angle steels 202 and two Q390 end face steel plates 201 with a length of 0.8 m, a width of 0.8 m and a thickness of 20 mm. The end face steel plate 201 is provided with six first holes 206-1 according to the design, which are arranged in two columns and three rows. One column has three first holes 206-1, and the two columns of first holes 206-1 are symmetrically arranged along the central axis of the end face steel plate 201. The vertical distance between the adjacent holes in one column of first holes 206-1 is the same, which is 200 mm. The center of the uppermost first hole 206-1 is 150 mm away from the upper edge of the end face steel plate 201, and 650 mm away from the lower edge of the end face steel plate 201. One row has two first holes 206-1, and the horizontal distance between the centers of the first holes 206-1 is 600 mm. The first holes 206-1 on the end face steel plate 201 have a diameter of 40 mm. A Q390 side steel plate 203 with a length of 0.5 m, a width of 0.6 m and a thickness of 10 mm is welded on the frame, and there are a total of four side steel plates 203. Each side steel plate 203 is provided with three second holes 206-2 according to the design. The three second holes 206-2 are arranged in a column, and the vertical distance between the centers of the adjacent second holes 206-2 is 200 mm. The uppermost second hole 206-2 is 50 mm away from the upper edge of the side steel plate 203, 550 mm away from the lower edge, 280 mm away from the left side edge, and 220 mm away from the right side edge. The holes on the side steel plate 203 have a diameter of 40 mm. A bottom steel plate 205 with a length of 0.5 m, a width of 0.6 m and a thickness of 10 mm is welded.

[0090] Three transverse embedded pipes 3 are arranged at both ends of the foundation pit support beam section. The transverse embedded pipe 3 is a stainless steel pipe with an outer diameter of 40 mm, an inner diameter of 36 mm and a length of 0.8 m. The transverse embedded pipe 3 is open at both ends. The transverse embedded pipe 3 is inserted into the second hole 206-2 and welded and fixed with the side steel plate 203. Six longitudinal embedded pipes 3 are arranged at both ends of the foundation pit support beam section. The longitudinal embedded pipe 3 is a stainless steel pipe with an outer diameter of 40 mm, an inner diameter of 36 mm and a length of 1 m. The longitudinal embedded pipe 3 is open at one end and sealed at the other end. The sealed end is located on the inner side. The open end of the longitudinal embedded pipe 3 is inserted into the first hole 206-1, and the longitudinal embedded pipe 3 is welded and fixed with the end face steel plate 201.

[0091] Two 18 mm HRB400 vertical steel bars 7 are used to connect the horizontal embedded pipe 3 and the longitudinal embedded pipe 3, and the vertical steel bars 7 are welded and fixed at the contact positions of the horizontal embedded pipe 3 and the longitudinal embedded pipe 3;

[0092] The longitudinal steel bars are 18 mm HRB400, and the stirrups are 10 mm HRB336. The steel bars are bound according to the design. The end portions of part of the longitudinal steel bars 6 are bound on the longitudinal embedded pipe 3;

[0093] After the steel bars are bound, the top steel plate 204 is welded. The top steel plate 204 has a length of 0.5 m, a width of 0.6 m, and a thickness of 10 mm, and forms the beam sleeve 2;

[0094] Water-based release agent is applied on the bottom mold 9;

[0095] The welded beam sleeve 2 is placed on the bottom mold 9;

[0096] After the side mold 10 and the end mold 11 are applied with water-based release agent, they are installed. During installation, the side mold 10 and the end mold 11 should be completely attached to the beam sleeve 2;

[0097] The concrete is poured into the mold. During pouring, the end portions of the longitudinal embedded pipe 3 and the horizontal embedded pipe 3 are sealed with gypsum. During pouring, the longitudinal embedded pipe 3 and the horizontal embedded pipe 3 should not be offset. After pouring is completed, the vibrator is vibrated until no air bubbles are generated;

[0098] After the rectangular steel reinforced concrete 1 forms strength, demolding and curing are performed. After curing is completed, demolding is performed;

[0099] After demolding is completed, the excess concrete on the surface of the beam sleeve 2 is removed. The sealing gypsum of the longitudinal embedded pipe 3 and the horizontal embedded pipe 4 is removed. A protective layer is applied on the surface of the concrete. Anti-rust paint is brushed on the surface of the beam sleeve 2 and the inner walls of the longitudinal embedded pipe 3 and the horizontal embedded pipe 4.

[0100] Example 3

[0101] A foundation pit has a land area of 13000 mm 2 The cross-sectional size of the foundation pit support beam section is designed to have a height of 800 mm and a width of 1000 mm. The design length of the foundation pit support beam section is 5 m.

[0102] The remaining concrete residues in the mold placement area are cleaned. The splicing positions of the side mold 10 and the end mold 11, and the splicing positions of the side mold 10 and the end mold 11 with the bottom mold 9 are cleaned.

[0103] The beam sleeve 2 is welded into a frame by four long 5 m L100x10 angle steels 202 and two Q390 end face steel plates 201 with a length of 1 m, a width of 0.8 m and a thickness of 20 mm. The end face steel plate 201 is provided with six first holes 206-1 according to the design and is arranged in two columns and three rows. One column has three first holes 206-1, and the two columns of first holes 206-1 are symmetrically arranged along the central axis of the end face steel plate 201. The center vertical distance between adjacent first holes 206-1 in one column is the same, which is 200 mm. The center of the uppermost first hole 206-1 in one column is 150 mm away from the upper edge of the end face steel plate 201 and 650 mm away from the lower edge of the end face steel plate 201. One row has two first holes 206-1, and the center horizontal distance between the first holes 206-1 is 800 mm. The first holes 206-1 on the end face steel plate 201 have a diameter of 40 mm. Four Q390 side face steel plates 203 with a length of 0.5 m, a width of 0.6 m and a thickness of 10 mm are welded on the frame. Each side face steel plate 203 is provided with three second holes 206-2 according to the design. The three second holes 206-2 are arranged in a column, and the center vertical distance between the vertically adjacent second holes 206-2 is 200 mm. The uppermost second hole 206-2 is 50 mm away from the upper edge of the side face steel plate 203 and 550 mm away from the lower edge. It is 380 mm away from the left side edge and 120 mm away from the right side edge. The second holes 206-2 on the side face steel plate 203 have a diameter of 40 mm. A bottom face steel plate 205 with a length of 0.5 m, a width of 0.8 m and a thickness of 10 mm is welded.

[0104] Three transverse embedded pipes 4 are arranged at both ends of the foundation pit support beam section. The transverse embedded pipe 4 is a stainless steel pipe with an outer diameter of 40 mm, an inner diameter of 36 mm and a length of 1 m. The transverse embedded pipe 4 is open at both ends. The transverse embedded pipe 4 is inserted into the second hole 206-2 and is welded and fixed with the side face steel plate 203. Six longitudinal embedded pipes 3 are arranged at both ends of the foundation pit support beam section. The longitudinal embedded pipe 3 is a stainless steel pipe with an outer diameter of 40 mm, an inner diameter of 36 mm and a length of 1 m. The longitudinal embedded pipe 3 is open at one end and sealed at the other end. The sealed end is located on the inner side. The open end of the longitudinal embedded pipe 3 is inserted into the first hole 206-1, and the longitudinal embedded pipe 3 is welded and fixed with the end face steel plate 201.

[0105] Two 18 mm HRB400 vertical steel bars 7 are used to connect the transverse embedded pipe 4 and the longitudinal embedded pipe 3. The vertical steel bar 7 is welded and fixed with the transverse embedded pipe 4 and the longitudinal embedded pipe 3 at the contact position.

[0106] The longitudinal reinforcement is 18 mm HRB400, and the stirrup is 10 mm HRB336. The reinforcement is bound according to the design. Part of the longitudinal steel bars 6 are bound at the end of the longitudinal embedded pipe 3.

[0107] After the reinforcement is tied, the top steel plate 204 is welded, the top steel plate 204 is 0.5 m in length, 0.8 m in width and 10 mm in thickness, and the beam sleeve 2 is formed;

[0108] Water-based release agent is applied on the bottom mold 9;

[0109] The welded beam sleeve 2 is placed on the bottom mold 9;

[0110] After the side mold 10 and the end mold 11 are applied with water-based release agent, the side mold 10 and the end mold 11 are installed, and the side mold 10 and the end mold 11 should be completely attached to the beam sleeve 2 during installation;

[0111] The concrete is poured into the mold, the longitudinal embedded pipe 3 and the transverse embedded pipe 4 are sealed with gypsum at the end during pouring, the longitudinal embedded pipe 3 and the transverse embedded pipe 4 should not be deviated during pouring, and the vibrating rod is vibrated after pouring to generate no bubbles;

[0112] After the rectangular steel reinforced concrete 1 forms strength, the mold is removed and maintained, and the mold is removed after maintenance is completed;

[0113] After the mold is removed, the excess concrete on the surface of the beam sleeve 2 is removed, the sealing gypsum of the longitudinal embedded pipe 3 and the transverse embedded pipe 4 is removed, a protective layer is applied on the surface of the concrete, and anti-rust paint is brushed on the surface of the beam sleeve 2 and the inner wall of the longitudinal embedded pipe 3 and the transverse embedded pipe 4.

[0114] The above embodiments are only preferred technical solutions of the present application, and should not be regarded as limitations of the present application. The embodiments in the application and the features in the embodiments can be combined with each other as long as they do not conflict. The protection scope of the present application should be based on the technical solutions claimed in the claims, and include equivalent replacement solutions of the technical features claimed in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present application.

[0115] It should be noted that, in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0116] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An assembled foundation pit support beam section convenient to disassemble, comprising a cuboid reinforced concrete (1), a beam sleeve (2), a longitudinal embedded pipe (3) and a transverse embedded pipe (4), characterized in that: The first hole (206-1) is arranged on the end face steel plate (201), and the second hole (206-2) is arranged on the side face steel plate (203); one end of the longitudinal embedded pipe (3) is welded to the inner wall of the first hole (206-1) to form a longitudinal plug hole (207), and the other end is inserted into the cuboid reinforced concrete (1) and is parallel to the angle steel (202); the two ends of the transverse embedded pipe (4) are welded to the hole walls of the second holes (206-2) on the two side face steel plates (203) to form a transverse plug hole (208), and are perpendicular to the angle steel (202); the longitudinal embedded pipe (3) and the transverse embedded pipe (4) do not intersect; The beam sleeve (2) wraps the cuboid reinforced concrete (1), wherein the beam sleeve (2) is formed by welding the end face steel plate (201), the angle steel (202), the side face steel plate (203), the top face steel plate (204) and the bottom face steel plate (205), the two end heads of the beam sleeve (2) are the same structure, and each end head is formed by welding one end face steel plate (201), two side face steel plates (203), one top face steel plate (204) and one bottom face steel plate (205), and the two end heads are connected by four angle steels (202); When the transverse plug hole (208) and the longitudinal plug hole (207) are spliced in the foundation pit support beam section, the connecting steel bars (5) are inserted into the transverse plug hole (208) and the longitudinal plug hole (207); The side face steel plate (203) of the beam sleeve (2) is additionally welded with a clasp (209), and the clasps (209) are uniformly arranged on the side face steel plate (203); After the foundation pit support beam section is connected in the axial direction by the connecting steel bars (5), the connecting steel plates (8) are used for connection, and the connecting steel plates (8) are inserted into the clasps (209) at the end heads of the two foundation pit support beam sections; The clasp (209) is a hollow cuboid steel member; The vertical steel bars (7) are used to connect the transverse embedded pipe (4) and the longitudinal embedded pipe (3), and the vertical steel bars (7) are welded and fixed at the contact positions of the transverse embedded pipe (4) and the longitudinal embedded pipe (3); The plug connection method of the assembled foundation pit support beam section convenient for disassembly can completely recycle the foundation pit support beam section after use.

2. The demountable fabricated pit support beam segment of claim 1, wherein: The hole diameters of the longitudinal plug hole (207) and the transverse plug hole (208) are the same.

3. The demountable fabricated pit support beam segment of claim 1, wherein: The vertical distances between adjacent longitudinal plug holes (207) or transverse plug holes (208) are the same, and the distance between the uppermost longitudinal plug hole (207) and the upper edge of the beam sleeve (2) is equal to the distance between the lowermost transverse plug hole (208) and the lower edge of the beam sleeve (2).

4. The demountable fabricated pit support beam segment of claim 1, wherein: The longitudinal plug holes (207) are two rows, and the transverse plug holes (208) are one row; the distance between the two rows of longitudinal plug holes (207) is equal to twice the distance between the transverse plug hole (208) and the end face steel plate (201).

5. The demountable fabricated pit support beam segment of claim 1, wherein: The longitudinal embedded pipe (3) is a steel pipe with threads on the outer side and smoothness on the inner side, one end of the steel pipe is sealed and the other end is opened; the transverse embedded pipe (4) is a steel pipe with threads on the outer side and smoothness on the inner side, and the two ends of the steel pipe are opened.

6. The method of claim 1-5, wherein, The method comprises the following steps: 1) Clean up the residual concrete residues in the mold placement area, clean up the joint between the side mold (10) and the end mold (11), and the joint between the side mold (10) and the end mold (11) and the bottom mold (9); 2) Weld the beam sleeve (2), four angle steels (202) and two end face steel plates (201) to form a frame, and weld the side steel plate (203) and the bottom steel plate (205) on the frame; 3) Insert the transverse embedded pipe (4) into the second hole (206-2) and weld it, and insert the longitudinal embedded pipe (3) into the first hole (206-1) and weld it; 4) Connect the transverse embedded pipe (4) and the longitudinal embedded pipe (3) with vertical steel bars (7), and weld the contact parts of the vertical steel bars (7) with the transverse embedded pipe (4) and the longitudinal embedded pipe (3); 5) Reinforcement binding; 6) After the reinforcement binding is completed, weld the top steel plate (204) to form the beam sleeve (2); 7) Apply water-based release agent on the bottom mold (9); 8) Place the welded beam sleeve (2) on the bottom mold (9); 9) After applying water-based release agent on the side mold (10) and the end mold (11), install them, and make sure that the side mold (10) and the end mold (11) are completely attached to the beam sleeve (2) during installation; 10) Pour concrete into the mold, and use gypsum to seal the ends of the longitudinal embedded pipe (3) and the transverse embedded pipe (4) before pouring, make sure that the longitudinal embedded pipe (3) and the transverse embedded pipe (4) do not shift before pouring, and use a vibrating rod to vibrate until no air bubbles are generated after pouring is completed; 11) After the rectangular steel reinforced concrete (1) forms strength, demold and maintain, and after maintenance is completed, demold; 12) After demolding is completed, remove the excess concrete on the surface of the beam sleeve (2), remove the sealing gypsum of the longitudinal embedded pipe (3) and the transverse embedded pipe (4), apply a protective layer on the surface of the concrete, and brush anti-rust paint on the surface of the beam sleeve (2) and the inner wall of the longitudinal embedded pipe (3) and the transverse embedded pipe (4).

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