Concrete support structure of an internal steel and construction method thereof

Abstract

The application discloses a concrete supporting structure with an inserted steel and a construction method thereof. The concrete supporting structure comprises a steel core column and concrete wrapped around the steel core column. The steel core column is inserted into the concrete before initial setting of the concrete and is pulled out when recycled. The steel core column is coated with a separator before being inserted into the concrete. The concrete supporting structure with the inserted steel comprises a supporting pile, a double-row pile or a continuous wall. The steel core column comprises a steel piece extending along a pile hole and inserted into the pile hole, a hoisting piece arranged on the steel piece for hoisting the steel core column, and a reinforcing piece arranged perpendicularly to a surface of the steel piece and fixed on the steel piece. The reinforcing piece has a certain length and is fully gripped with the concrete before recycling to enhance the bearing capacity of lateral soil pressure. The reinforcing piece is broken when an external force is applied so that the steel core column can be pulled out from the concrete when recycled.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure generally relate to the field of building construction foundation pit support, and more particularly, to a concrete support structure with embedded steel and a construction method thereof. BACKGROUND

[0002] With the continuous development of urban construction and large-scale development of underground space, pile anchoring technology in foundation pits is widely used, and the most commonly used in the enclosure structure system in the field of foundation pit support is the cast-in-place pile technology, for example, a steel reinforcement cage is inserted into concrete to form a support structure such as a slope protection pile or a continuous wall (the inner core of which is a steel reinforcement cage). However, as a temporary retaining wall structure of the foundation pit, the cast-in-place pile will end its mission once the foundation is completed, at which time a large amount of steel embedded therein cannot be recycled, causing environmental pollution, soil pollution, metal loss, and other problems, and is not in line with the current "resource-saving and environment-friendly" concept under the background of "double carbon". In addition, due to the high cost of manufacturing and transporting the steel reinforcement cage, the steel reinforcement cage needs to be calibrated in the process of lowering, and problems such as deformation of the steel reinforcement cage may occur, so that the support effect is greatly affected in actual construction.

[0003] The existing SMW (Soil Mixing Wall, also known as new cement-soil mixing pile wall or reinforced cement-soil mixing wall) method is a method of inserting steel into a cement-soil pile, which inserts H-shaped steel or other profiles into the cement-soil pile to combine load bearing and water seepage prevention, so as to become a support structure with both load bearing and water seepage prevention functions. In the existing SMW method, a layer of friction-reducing agent is coated on the surface of the steel, so it can be recycled after the foundation construction is completed. However, in the SMW method, steel is used as an embedded steel skeleton to bear lateral soil pressure, and a layer of friction-reducing agent is coated on the surface of the steel to facilitate recycling after the foundation construction is completed. Therefore, the interfacial adhesion between the steel and the cement-soil and the overall gripping stress are low, so the overall steel cannot bear strong lateral soil pressure and cannot be applied to deep foundation pits and other scenarios that require strong lateral soil pressure.

[0004] At present, a composite structure of steel reinforced concrete has appeared in the main structure part of the building field, that is, a kind of independent structure type in which steel is embedded in reinforced concrete. This structure has the advantages of large bearing capacity, large stiffness, good seismic performance, and good local and overall stability of the structure, because the steel is added in the reinforced concrete and has its inherent strength and ductility. However, this process is only used for the main structure of the building field (such as stiffening columns), and cannot realize the recycling of steel and steel, has high cost, and has not been used as an underground support structure.

[0005] Therefore, there is a need for a type of recyclable steel that can be used in support technologies for deep foundation pits and other scenarios that require strong lateral earth pressure. Summary of the Invention

[0006] The main objective of this invention is to provide a concrete support structure with inserted steel profiles and its construction method to solve the above-mentioned problems and other potential problems in the prior art.

[0007] To achieve the above objectives, this invention proposes a concrete support structure with an inserted steel profile, comprising a steel core column and concrete surrounding the steel core column; the steel core column is inserted before the concrete initially sets and pulled out during recovery; the steel core column is covered with a separating material before insertion into the concrete; wherein, the concrete support structure with the inserted steel profile includes retaining piles, double-row piles, or a continuous wall; the steel core column includes steel components, lifting components, and reinforcing components. The steel profile extends along the pile hole and is inserted into the pile hole; the lifting device is mounted on the steel profile for lifting the steel core column; the reinforcing member is disposed perpendicular to the surface of the steel profile and fixed to the steel profile; wherein, the reinforcing member has a certain length and is fully bonded with the concrete before recycling to enhance its ability to withstand lateral earth pressure; the reinforcing member will break when an external force is applied so that the steel core column can be pulled out of the concrete during recycling.

[0008] According to an embodiment of the present invention, the lifting component includes at least one of the following: lifting hole, lifting lug, and lifting tool.

[0009] According to an embodiment of the present invention, the lifting holes are symmetrically arranged on both sides of the steel profile; the lifting lugs are symmetrically arranged on both sides of the steel profile.

[0010] According to an embodiment of the present invention, the reinforcing member includes at least one of the following: a plastic screw; a mating plastic bolt and nut; a plastic threaded rod; a plastic stud; a plastic pin; and a plastic rivet.

[0011] According to an embodiment of the present invention, the reinforcing member is uniformly disposed on the surface of the steel profile.

[0012] According to an embodiment of the present invention, the steel components include at least one of the following: H-beams, angle steel, channel steel, steel pipes, I-beams, and sheet piles.

[0013] According to an embodiment of the present invention, the H-beam includes a first flange and a second flange arranged parallel to each other, and a web located between the first flange and the second flange and arranged perpendicularly.

[0014] According to an embodiment of the present application, the lifting member comprises a first lifting hole arranged on the first flange and / or a second lifting hole arranged on the second flange; the first lifting hole and the second lifting hole are arranged symmetrically with respect to each other.

[0015] According to an embodiment of the present application, the reinforcing member comprises at least one of: a first plastic bolt arranged on the first flange, a second plastic bolt arranged on the second flange, and a third plastic bolt arranged on the web.

[0016] According to an embodiment of the present application, a first screw hole corresponding to the first plastic bolt is arranged on the first flange, a second screw hole corresponding to the second plastic bolt is arranged on the second flange, and a third screw hole corresponding to the third plastic bolt is arranged on the web.

[0017] According to an embodiment of the present application, a first nut matched with the first plastic bolt is further arranged on the first plastic bolt, a second nut matched with the second plastic bolt is further arranged on the second plastic bolt, and a third nut matched with the third plastic bolt is further arranged on the third plastic bolt.

[0018] According to an embodiment of the present application, the concrete forms a concrete column, the concrete columns are connected to each other by a crown beam at the top, and the extension direction of the crown beam is perpendicular to the concrete columns.

[0019] According to an embodiment of the present application, the spacer comprises at least one of: a friction-reducing agent, a release agent, lubricating oil, wax, and a heat-shrinkable tube.

[0020] The second aspect of the present application provides a construction method of a concrete support structure with an inserted steel section, characterized in that the construction method can form the concrete support structure with an inserted steel section according to the first aspect of the present application.

[0021] According to an embodiment of the present application, the construction method comprises: manufacturing the steel core column and coating the spacer on the steel core column; and inserting the steel core column coated with the spacer into the concrete before initial setting, so as to form the concrete support structure with an inserted steel section.

[0022] According to an embodiment of the present application, the construction method of the concrete support structure with an inserted steel section further comprises: when being recycled, applying an external force to the steel core column to reach the ultimate bearing capacity of the reinforcing member, so that the reinforcing member is broken, and the steel core column is pulled out. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0024] FIG. 1 Structure diagram of the steel core column (without reinforcing member) of the exemplary embodiment of the present application.

[0025] FIG. 2 Structure diagram of the steel core column (with reinforcing member) of the exemplary embodiment of the present application.

[0026] FIG. 3 Structure diagram of the steel core column in the concrete column of the exemplary embodiment of the present application. FIG. 2 Structure diagram of the cross section in one direction.

[0027] FIG. 4 Structure diagram of the cross section in another direction. FIG. 2 Structure diagram of the cross section in another direction.

[0028] FIG. 5 Structure diagram of the steel core column in the concrete column of the exemplary embodiment of the present application.

[0029] FIG. 6 Structure diagram of the steel core column and the crown beam of the exemplary embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.

[0031] The inventor of the present application found in practice that burying the steel in the concrete can form an independent structure type. This structure has increased steel in the concrete, and the steel has its inherent strength and ductility. Therefore, compared with the traditional reinforced concrete structure, the steel and the concrete work integrally, so that the steel concrete structure has the advantages of large bearing capacity, large stiffness, good seismic performance, and good local and overall stability. In particular, in order to realize the recycling of the steel, the present embodiment also coats a separator around the steel. In order to enhance the ability to withstand lateral earth pressure, the present embodiment also innovatively designs the structure of the steel, and specially designs the structure of the reinforcing member 3, so as to be applicable to scenarios such as deep foundation pits which have high requirements on the ability to withstand lateral earth pressure.

[0032] As shown in FIGS. 1-6 The present application provides a concrete supporting structure with interposed steel, which comprises a steel core column 100 and concrete 200 wrapped around the steel core column 100. The steel core column 100 is inserted into the concrete 200 before initial setting of the concrete 200 and is pulled out when recycled. The steel core column 100 is coated with a separator (not shown) before being inserted into the concrete 200.

[0033] It should be understood that, in comparison with a conventional reinforced concrete structure, the steel and the concrete in the present application can work integrally and are both taken into account in stress calculation, so that the steel-concrete structure can have the advantages of large bearing capacity, large rigidity, good anti-seismic performance, and good local and overall stability.

[0034] According to an embodiment of the present application, the concrete supporting structure with interposed steel comprises a supporting pile, or a double-row pile, or a continuous wall. As an example, the supporting pile is a pile mainly bearing lateral thrust, which is generally used for foundation pit supporting, slope supporting and landslide treatment, and bears horizontal soil pressure or landslide thrust. As an example, the double-row pile is a supporting structure composed of rigid frames and corbel beams, which are connected by front and rear rows of supporting piles and beams arranged along the sidewall of a foundation pit. As an example, the continuous wall, also known as underground continuous wall, is a continuous concrete wall built underground in foundation engineering, which is used as a water-cutting, anti-seepage, load-bearing and water-retaining structure.

[0035] According to an embodiment of the present application, the steel core column comprises a steel piece 1, a hoisting piece 2 and a reinforcing piece 3. The steel piece 1 extends along a pile hole and is inserted into the pile hole. The hoisting piece 2 is arranged on the steel piece 1 for hoisting the steel core column. The reinforcing piece 3 is arranged perpendicularly to the surface of the steel piece 1 and is fixed on the steel piece 1.

[0036] The reinforcing piece 3 has a certain length and is in full contact (for example, fully wrapped or gripped) with the concrete before recycling, so as to enhance the bearing capacity of lateral soil pressure. The reinforcing piece 3 will be broken when an external force is applied (for example, when the external force reaches the ultimate bearing capacity of the reinforcing piece 3, the reinforcing piece 3 will reach the limit of stress state and thus be broken), so as to facilitate pulling out of the steel core column from the concrete when recycled. That is, the reinforcing piece 3 of the present application can achieve the technical effect of “controlled relaxation”, which can enhance the bearing capacity of lateral soil pressure before recycling (i.e. “tension effect”), and can be broken when recycling is needed, so as to facilitate pulling out of the steel core column (i.e. “relaxation effect”).

[0037] It should be understood that, due to the structure of the reinforcing member 3 specially designed in the steel core column (which is arranged perpendicularly to the surface of the steel member 1 and has a certain length), the bearing capacity of the lateral soil pressure (for example, in the direction perpendicular to the pile hole) can be enhanced, the interface bonding force and the overall gripping stress between the steel and the concrete can be enhanced, so that the overall supporting structure can bear stronger lateral soil pressure, and thus can be applied to deep foundation pits and other scenarios requiring stronger lateral soil pressure. In addition, due to the use of the steel core column with the structure of the reinforcing member 3, the present application is different from the traditional technology and supporting structure, and can be applied to steel-concrete structures requiring stronger bearing capacity (at this time, the concrete and the steel can jointly act, the interface bonding force and the gripping stress between the steel and the concrete can be improved, so as to meet the requirement of stronger bearing capacity of the steel core column).

[0038] According to an embodiment of the present application, the hoisting member 2 comprises at least one of the following: a lifting hole, a lifting lug, a lifting tool. As an example, the lifting hole can be a hole arranged on the steel member 1, such as a round hole or a square hole, etc. The lifting lug can be welded on the lifting lug of the steel member 1 (which can also be integrally formed). The lifting tool, for example, is a separate or auxiliary hoisting tool, which can clamp the steel member 1 to realize the function of hoisting the steel core column. In the hoisting process, a separate crane or other equipment is needed to realize hoisting, so as to insert the steel core column into the pile hole below the ground along the pile hole.

[0039] According to an embodiment of the present application, the lifting holes are symmetrically arranged on both sides of the steel member 1; the lifting lugs are symmetrically arranged on both sides of the steel member 1. As an example, the lifting holes or the lifting lugs can be symmetrically arranged on both sides of the steel member 1, so as to facilitate hoisting from both sides (for example, inserting the lifting hook).

[0040] According to an embodiment of the present application, the reinforcing member 3 comprises at least one of the following: a plastic screw; a plastic bolt and a nut cooperating with each other; a plastic screw rod; a plastic stud; a plastic pin; a plastic rivet.

[0041] It should be understood that the material of the reinforcing member 3 in the present application is preferably plastic, such as nylon, which is an original design of the inventor of the present application considering the design requirements of the supporting structure in the field of construction, and can achieve the purpose and effect of "flexibility" mentioned above. That is, the reinforcing member 3 made of such plastic material can be conveniently installed on the steel member 1 to enhance the bearing capacity of the lateral soil pressure, and can be broken under a certain external force (for example, when the external force reaches the ultimate bearing capacity of the reinforcing member 3, the reinforcing member 3 will reach the ultimate stress state and be broken), thereby facilitating the extraction and recycling of the steel core column.

[0042] As an example, a plastic screw is a type of fastener that is tightened gradually using the physics and mathematics of the bevel circular rotation of the object and friction. The plastic screw can also be referred to as a plastic screw, which is usually cylindrical and has a concave-convex groove on the surface, referred to as a thread. At this time, the structure on the steel member 1 that cooperates with the plastic screw can be a thread (at this time, a hole can be punched and threaded on the steel member 1).

[0043] As an example, a plastic bolt is a type of cylindrical threaded fastener that is used with a nut, which is composed of a head and a screw rod (a cylinder with external threads), and is a type of fastener that cooperates with a nut, and this connection is referred to as a bolt connection. The nut can be unscrewed from the bolt, so the bolt connection is a detachable connection. Compared to the plastic screw, the plastic bolt and the nut that cooperate with each other are more simple and practical, and do not have to form a hole with a thread on the steel member 1, so it is simpler to process and has a lower cost (for example, only a hole is punched on the steel member 1, and then a plastic bolt is inserted and a plastic nut or a metal nut is screwed).

[0044] As an example, a plastic screw rod refers to a cylinder with a spiral groove on the outer surface or a cone with a tapered spiral groove. The plastic screw rod can have different heads, such as a hexagonal screw rod, a large flat screw rod, etc. As an example, a plastic stud refers to a cylindrical fastener with threads on both ends. As an example, a plastic pin refers to a type of fastener that is mainly used for assembly and positioning, and its types include cylindrical pins, conical pins, hole pins, and split pins. As an example, a plastic rivet is a type of nail-shaped object that is riveted using its own deformation or interference connection in riveting.

[0045] According to an embodiment of the present application, the reinforcing members 3 are uniformly arranged on the surface of the steel member 1. It should be understood that the reinforcing members 3 uniformly arranged on the surface of the steel member 1 facilitate stress calculation and processing. For example, the present application can arrange plastic screws at equal intervals of 100 mm on the surface of the H-shaped steel, so as to increase the gripping stress of the steel member 1 and the concrete in the service stage (working stage), and the reinforcing members 3 can be brittle and lose force instantaneously after being subjected to a certain strength of tension (for example, the reinforcing members 3 made of plastic material can be broken under a certain external force due to the nature of the material itself), so the steel core column is easily pulled out in the recycling stage.

[0046] According to an embodiment of the present application, the profile steel piece 1 comprises at least one of the following: H-shaped steel, angle steel, channel steel, steel pipe, I-beam, steel sheet pile. As an example, the profile steel piece 1 of the present application can be H-shaped steel, angle steel, channel steel, steel pipe, I-beam, steel sheet pile. As an example, angle steel is commonly known as angle iron, which is a long strip of steel with two mutually perpendicular angles. As an example, channel steel is a long strip of steel with a groove-shaped cross section, which belongs to carbon structural steel for construction and machinery, and is a complex cross-section profile steel material with a groove-shaped cross section. As an example, I-beam, also known as steel beam, is a long strip of steel with a cross-section in the shape of an I-beam. As an example, steel sheet pile is a kind of steel structure with a linkage device at the edge, and the linkage device can be freely combined to form a continuous and close retaining wall for retaining soil or water, for example, including Larsen steel sheet pile (also known as U-shaped steel sheet pile), which is mainly used for retaining soil, water and sand walls during bridge cofferdam construction, large pipeline laying, temporary trench excavation, and is used for retaining walls, retaining walls, embankment protection, etc. in wharfs and unloading yards.

[0047] According to an embodiment of the present application, the H-shaped steel comprises a first flange 11 and a second flange 12 arranged in parallel with each other, and a web 13 arranged perpendicularly between the first flange and the second flange. As an example, H-shaped steel is mainly composed of two flanges arranged in parallel with each other, and a web arranged therebetween. H-shaped steel is an economical cross-section high-efficiency profile with more optimized cross-section area distribution and more reasonable strength-to-weight ratio. Since each part of the H-shaped steel is arranged at a right angle, the H-shaped steel has the advantages of strong bending resistance in all directions, simple construction, cost saving, and light structure weight.

[0048] According to an embodiment of the present application, the lifting piece 2 comprises a first lifting hole 21 arranged on the first flange 11, and / or a second lifting hole 22 arranged on the second flange 12; the first lifting hole 21 and the second lifting hole 22 are arranged symmetrically with each other. As an example, through the design of the symmetrically arranged lifting holes, the profile steel core column can be conveniently lifted.

[0049] According to an embodiment of the present application, the reinforcing piece 3 comprises at least one of the following: a first plastic bolt 31 arranged on the first flange 11, a second plastic bolt 32 arranged on the second flange 12, and a third plastic bolt 33 arranged on the web 13. As an example, plastic bolts can be arranged on the flanges and webs of H-shaped steel, for example, can be arranged uniformly, thereby enhancing the ability to withstand lateral soil pressure in the direction perpendicular to the pile hole.

[0050] According to an embodiment of the present invention, a first screw hole 34 corresponding to the first plastic bolt 31 is provided on the first flange 11, a second screw hole 35 corresponding to the second plastic bolt 32 is provided on the second flange 12, and a third screw hole 36 corresponding to the third plastic bolt 33 is provided on the web 13. For example, the first screw hole 34, the second screw hole 35, and the third screw hole 36 can be formed directly on the H-beam by a drilling process.

[0051] According to an embodiment of the present invention, the first plastic bolt 31 is further provided with a matching first nut 37, the second plastic bolt 32 is further provided with a matching second nut 38, and the third plastic bolt 33 is further provided with a matching third nut 39. For example, the first nut 37, the second nut 38, and the third nut 39 can be plastic lock nuts or metal nuts.

[0052] like FIGS. 5-6 As shown, according to an embodiment of the present invention, the concrete 200 forms concrete columns, and the concrete columns are interconnected by a top capping beam 300, the extension direction of which is perpendicular to the concrete columns. The design of the capping beam 300 makes the overall structure more stable and robust.

[0053] According to embodiments of the present invention, the separator comprises at least one of the following: a friction reducer, a release agent, a lubricant, a wax, and a heat shrink tubing. As an example, the friction reducer is a material applied to the surface of the inserted steel profile before insertion to reduce frictional resistance during removal when the profile needs to be recycled. As an example, the release agent is an interface coating that makes the surface of the object easy to remove, smooth, and clean. As an example, the lubricant is an intermediary between two objects that reduces friction caused by contact between them. As an example, the heat shrink tubing is a specially made polyolefin heat shrink sleeve that can act as a separator and can be wrapped around the surface of the steel profile when heated.

[0054] Exemplary embodiments of a construction method for a concrete support structure with interposed steel.

[0055] The present invention also provides a construction method for a concrete support structure with inserted steel sections, which can form the concrete support structure with inserted steel sections as described in the above embodiments. Specifically, the construction method of the embodiments of the present invention may include the following steps.

[0056] Step S1000: making the profile steel core column 100 and coating the insulator on the profile steel core column 100. As an example, when making the profile steel core column 100, the profile steel with the required drilling holes can be placed on a relatively flat ground (the place where the drilling is performed can be positioned by marking a line), then the holes are drilled and cut in a clockwise direction (the rotation speed can be controlled to prevent too fast), and water can be prepared to cool the drill bit when drilling. After the holes are drilled, the burrs around the holes can be cleaned and deburred using a grinding machine.

[0057] Step S2000: inserting the profile steel core column 100 coated with the insulator into the concrete 200 before initial setting to form the concrete support structure with internally inserted profile steel. Preferably, the profile steel core column 100 coated with the insulator can be inserted into the concrete 200 before initial setting and positioned to form the concrete support structure with internally inserted profile steel.

[0058] As an example, the structure of the profile steel core column of the present application can be applied to a concrete environment, and the construction method of the present application can be used in a concrete environment. It should be understood that the profile steel core column coated with a friction-reducing agent is inserted into the pile hole and comes into contact with the concrete, so that the profile steel core column is wrapped (gripped) with the concrete, and the overall structure of the support structure mentioned in the above embodiments of the present application can be formed.

[0059] According to an embodiment of the present application, the construction method of the concrete support structure with internally inserted profile steel further includes step S3000: when recycling, an external force is applied to the profile steel core column 100 to reach the ultimate bearing capacity of the reinforcement 3, so that the reinforcement 3 is broken to pull out the profile steel core column 100. As an example, the profile steel core column should be inserted before the concrete is initially set. When recycling (i.e. during the recycling process, when the foundation pit is basically constructed and the earthwork is backfilled to the ground level, the profile steel core column needs to be recycled), the profile steel core column should be pulled out to achieve the recycling purpose. When recycling, a jack and a jacking reaction frame can be installed to pull out the profile steel.

[0060] The following describes the construction of the support structure according to the construction process of the engineering slope protection pile construction using the post-insertion profile steel pouring construction technology, which mainly includes: pile position line laying → profile steel processing → drilling machine positioning → hole forming → pouring concrete → lowering profile steel → making a crown beam → recycling profile steel.

[0061] 1) Pile position wire: ① Pile position is strictly according to the "foundation pit supporting plan" measurement, first put out the horizontal and vertical control axis, according to the control axis put out the pile center axis, determine the standard pile position of each side, according to the standard pile position in turn to measure and put other pile position. ② Pile position first with coarse steel vertical punching, hole depth is not less than 0.50 m, into the hole and insert lime into the fine steel head as a marker. ③ Pile position is determined, please the party, supervision, general package party and related units for retest, acceptance, confirm no error before can pile.

[0062] 2) Steel processing: according to the design drawing to make steel. Welder must be certified. Before the slope protection pile starts, 3 steel should be prepared in advance, please the resident engineer, the supervision engineer to check and pass, then carry on large-scale concentrated processing. Before the cast-in-place pile is formed, at least 10 steel should be processed. Steel is 20-30 for a batch of acceptance, please the supervision engineer to check and pass, then move to the designated site for storage. To prevent deformation, the maximum storage layer is less than 3 layers.

[0063] 3) Drilling in place: drill machine adopts long spiral drill machine. The operator under the command of the ground personnel, the drill machine drill center point is aimed at the pre-set pile point, adjust the drill pipe and drill machine leg, ensure the drill pipe vertical.

[0064] 4) Hole forming: before the overall construction of the cast-in-place pile, the site test drilling should be carried out to observe the hole forming effect and determine the hole forming drill machine and hole forming process. The resident engineer and the supervision engineer should be informed in advance. Before each drilling, the concrete should be prepared, and then the drilling can be started. Pay attention to the guide when drilling. If the deviation or obstacle is encountered, the cause should be analyzed and measures should be taken to deal with it. The measurement work should be done by the record keeper every time. The record must be filled in carefully according to the table requirements. The data must be complete and true. Do not alter. The drilling situation and the matters needing attention of the next shift should be handed over when the shift is over.

[0065] 5) Pouring concrete: adopt "long spiral drill machine hole forming, center pressure pouring concrete" process. Drill machine drills to the design hole depth, and then pours concrete. With the lifting of the drill, the concrete is poured to 30-50 cm above the design elevation of the pile top. For this method, the procedures of hoisting steel and pouring concrete should be exchanged, that is, pouring concrete first and then inserting steel. The special vibrator can be used to vibrate the concrete when the steel is hoisted into the hole by the crane. The concrete is commercial concrete. The pile after hole forming should be poured as soon as possible.

[0066] 6) Lowering steel: after the pile is formed, the drill machine should be removed as soon as possible to shorten the time between the final hole and the pouring of concrete. Immediately organize personnel and crane to hoist the steel. The steel should be checked before use. The steel is lowered by the crane.

[0067] 7) Making the crown beam: before the crown beam construction, the pile top should be measured according to the design requirement elevation, and the bored pile with the elevation exceeding the requirement by more than 10 cm must be chiseled. The chiseling of the pile top adopts pneumatic wind pick, and the chiseling of the pile top is required to be flat. After the chiseling work is completed, the crown beam construction is started. The crown beam construction is carried out in sections, and the mold is directly dug in the soil. The construction requires accurate line laying, consistent mold depth, and straight mold wall. If there is soil collapse, the soil can be smoothed with mortar or the mold can be leveled with a formwork. After the crown beam is poured, attention should be paid to maintenance.

[0068] 8) Recycling the steel: when recycling, a jack and a jacking reaction frame can be installed to pull out the steel.

[0069] Through the description of the above embodiments, those skilled in the art can clearly understand that the application can also be implemented by other structures, and the features of the application are not limited to the above preferred embodiments. Any changes or modifications that can be easily thought of by those skilled in the art in the technical field of the application should be covered within the scope of the patent protection of the application.

Claims

1. A concrete support structure of an interior steel, characterized by, The concrete support structure with an inserted steel core comprises a steel core column (100) and concrete (200) wrapped around the steel core column (100); the steel core column (100) is inserted into the concrete (200) before initial setting of the concrete (200) and is pulled out when recycled; the steel core column (100) is wrapped with a spacer before being inserted into the concrete (200); and the concrete support structure with an inserted steel core comprises a support pile, a double-row pile or a continuous wall. The steel core column comprises a steel piece (1), a hoisting piece (2) and a reinforcing piece (3). The steel piece (1) extends along a pile hole in a foundation pit support and is inserted into the pile hole; the hoisting piece (2) is arranged on the steel piece (1) for hoisting the steel core column; and the reinforcing piece (3) is arranged perpendicularly to a surface of the steel piece (1) and is fixed on the steel piece (1). The reinforcing piece (3) has a certain length and is fully gripped with the concrete before being recycled, so as to enhance the bearing capacity of the pile hole to lateral earth pressure in the pile hole in a direction perpendicular to the pile hole. The reinforcing piece (3) is broken when an external force is applied, so that the steel core column can be pulled out from the concrete when recycled. The reinforcing piece (3) is made of plastic, and the reinforcing piece (3) comprises at least one of the following: a plastic screw, a plastic bolt and a nut cooperating with each other, a plastic screw rod, a plastic stud, a plastic pin and a plastic rivet. The reinforcing pieces (3) are uniformly arranged on the surface of the steel piece (1). When the external force reaches the ultimate bearing capacity of the reinforcing piece (3), the reinforcing piece (3) reaches a limit stress state and is broken.

2. The concrete support structure of claim 1, wherein, The hoisting piece (2) comprises at least one of the following: a lifting hole, a lifting lug and a lifting device.

3. The concrete support structure of claim 2, wherein, The lifting holes are symmetrically arranged on both sides of the steel piece (1); and the lifting lugs are symmetrically arranged on both sides of the steel piece (1).

4. A concrete support structure of the type defined by any one of claims 1-3, characterized in that The steel piece (1) comprises at least one of the following: an H-shaped steel, an angle steel, a channel steel, a steel pipe, an I-beam and a steel sheet pile.

5. The concreting structure of the internal steel of claim 4, wherein, The H-shaped steel comprises first and second flanges (11 and 12) arranged in parallel to each other and a web (13) arranged perpendicularly between the first and second flanges.

6. The concreting structure of the internal steel of claim 5, wherein, The hoisting piece (2) comprises a first lifting hole (21) arranged on the first flange (11) and / or a second lifting hole (22) arranged on the second flange (12); and the first and second lifting holes (21 and 22) are symmetrically arranged with respect to each other.

7. A concrete support structure of in-line steel according to claim 5 or 6, characterised in that, The reinforcing piece (3) comprises at least one of the following: a first plastic bolt (31) arranged on the first flange (11), a second plastic bolt (32) arranged on the second flange (12) and a third plastic bolt (33) arranged on the web (13).

8. The concreting structure of the internal steel of claim 7, wherein, The first flange (11) is provided with a first screw hole (34) corresponding to the first plastic bolt (31), the second flange (12) is provided with a second screw hole (35) corresponding to the second plastic bolt (32), and the web (13) is provided with a third screw hole (36) corresponding to the third plastic bolt (33).

9. The concretesupport structure of claim 7, wherein The first plastic bolt (31) is further provided with a matching first nut (37), the second plastic bolt (32) is further provided with a matching second nut (38), and the third plastic bolt (33) is further provided with a matching third nut (39).

10. A concrete support structure of the type defined by any one of claims 1-3, characterized in that Wherein, The concrete (200) forms a concrete column, and the concrete columns are connected to each other through a crown beam (300) at the top, and the extension direction of the crown beam (300) is perpendicular to the concrete columns.

11. A concrete support structure of the type defined by any one of claims 1-3, characterized in that Wherein, The spacer includes at least one of the following: a friction-reducing agent, a release agent, lubricating oil, wax, and heat-shrinkable tube.

12. A construction method of a concrete support structure of an interior steel, characterized by, The construction method can form the internally inserted steel reinforced concrete support structure according to any one of claims 1-11.

13. The construction method of a concrete support structure of an in-line steel according to claim 12, characterized by, The construction method comprises: Manufacturing the steel core column (100) and coating the spacer on the steel core column (100); Inserting the steel core column (100) coated with the spacer into the concrete (200) before initial setting to form the internally inserted steel reinforced concrete support structure.

14. The construction method of a concrete support structure of an in-line steel according to claim 13, characterized by, Further comprising: When recycling, an external force is applied to the steel core column (100) to reach the ultimate bearing capacity of the reinforcing member (3), so that the reinforcing member (3) is broken to pull out the steel core column (100).

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