Steel stand column used in one-column-one-pile process under low clearance condition and construction method of steel stand column

Abstract

The invention discloses a steel stand column used in a one-column-one-pile process under a low clearance condition and a construction method of the steel stand column. The steel stand column comprises a telescopic sleeve, an anchor bolt and a hoop, and the telescopic sleeve comprises a plurality of pipe sections which are mutually nested from outside to inside and are telescopically connected; a spring lock bead is embedded in the inner wall of the outer side pipe section at the joint of every two adjacent pipe sections, and a lock bead limiting groove is formed in the outer wall of the corresponding inner side pipe section. The spring lock beads are clamped in the lock bead limiting grooves, so that the two adjacent pipe sections are connected in a limiting manner; the anchor bolts are used for being connected into the bolt holes in the connecting positions of the two adjacent pipe sections in a penetrating mode so that the two adjacent pipe sections can be connected in a locking mode; and the hoop is used for being mounted on the outer wall surfaces of the two adjacent pipe sections. The method has the advantages of being convenient and fast to construct, high in construction efficiency, low in cost and high in safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a steel stand column used in one-column-one-pile technology under low-clearance conditions and a construction method thereof. BACKGROUND

[0002] In urban renewal construction, the development of underground space of old, historical and other existing buildings requires temporary support and vertical load-bearing system to be constructed inside the existing building. Unlike the open construction environment of conventional new projects, the height of the existing building is low and the space is narrow. The space constraints make the steel stand column in the one-column-one-pile technology, which is a vertical load-bearing system of top-down method, unable to be hoisted in place and connected with the reinforcement cage as a whole. The steel stand column often adopts a construction method of segmented transportation, segmented hoisting and section-by-section welding. The splicing of each segment of the steel stand column not only exacerbates the space tension of the construction site, but also has obvious drawbacks such as long processing period, low efficiency, high labor and material costs. SUMMARY

[0003] The purpose of the present application is to provide a steel stand column used in one-column-one-pile technology under low-clearance conditions and a construction method thereof, so as to solve the problems of large space occupation, low connection efficiency and high construction cost of segmented welding of the steel stand column in one-column-one-pile technology under low-clearance conditions when using top-down method to develop underground space in existing buildings.

[0004] In order to solve the above technical problems, the present application provides a steel stand column used in one-column-one-pile technology under low-clearance conditions, comprising a telescopic sleeve, an anchor bolt and a clamp, wherein:

[0005] The telescopic sleeve comprises multiple pipe segments nested and connected in extension from outside to inside. The pipe segment located at the outermost side is an anchor pipe segment, the pipe segment located at the innermost side is a hoisting pipe segment, the upper end of the hoisting pipe segment is symmetrically provided with a hoisting hole, and the pipe segment located between the innermost side and the outermost side is an intermediate pipe segment. When the telescopic sleeve is in a contracted state, the inner pipe segments are sequentially contracted in the adjacent outer pipe segments. When the telescopic sleeve is in an elongated state, the inner pipe segments are extended from the adjacent outer pipe segments. A plurality of spring lock beads are embedded on the inner wall of the outer pipe segment at the connection of the adjacent two pipe segments and are uniformly distributed along the cross section. Correspondingly, a plurality of lock bead limiting grooves are provided on the outer wall of the inner pipe segment at the connection of the adjacent two pipe segments and are uniformly distributed along the cross section. When the adjacent two pipe segments are elongated to the connection, the adjacent two pipe segments are limitedly connected by the spring lock beads clamped in the lock bead limiting grooves. When the adjacent two pipe segments are retracted from the connection, the spring lock beads slide out of the lock bead limiting grooves to make the inner pipe segments contract in the outer pipe segments. A plurality of bolt holes are provided through the inner and outer pipe segments at the connection of the adjacent two pipe segments. A plurality of clamp limiting grooves are provided on the outer wall of the inner pipe segment at the connection of the adjacent two pipe segments and are uniformly distributed along the cross section.

[0006] The anchor bolt is used for locking and connecting the adjacent two pipe sections when the adjacent two pipe sections are elongated to the connecting position.

[0007] The hoop is used for being mounted on the outer wall surface of the adjacent two pipe sections and being locked and connected by the hoop bolt when the adjacent two pipe sections are elongated to the connecting position.

[0008] Further, the steel column used in the one-column-one-pile process under the low-clearance condition is provided.

[0009] Further, the steel column used in the one-column-one-pile process under the low-clearance condition is provided.

[0010] Further, the steel column used in the one-column-one-pile process under the low-clearance condition is provided.

[0011] Further, the steel column used in the one-column-one-pile process under the low-clearance condition is provided.

[0012] Further, the steel column used in the one-column-one-pile process under the low-clearance condition is provided.

[0013] Further, the steel column used in the one-column-one-pile process under the low-clearance condition is provided.

[0014] In order to solve the above technical problems, the application further provides a steel column construction method used in the one-column-one-pile process under the low-clearance condition.

[0015] After the pile hole is constructed in the lowermost building of the existing building and the reinforcement cage is lowered, the telescopic sleeve in the contracted state is transported into the lowermost building, the telescopic sleeve in the contracted state is connected to the hoisting equipment through the hoisting hole, and the telescopic sleeve in the contracted state is connected to the reinforcement cage through the anchor pipe section.

[0016] The steel reinforcement cage and the connecting telescopic sleeve are integrally lowered along the pile hole, and in the lowering process, each section pipe is lowered from outside to inside in sections, when the two adjacent pipe sections are elongated to the connecting position, the spring lock ball is clamped in the lock ball limiting groove to limit and connect the two adjacent pipe sections; the anchor bolt is connected in the bolt hole penetrating the inner and outer pipe sections at the connecting position of the two adjacent pipe sections to lock and connect the two adjacent pipe sections; the hoop is installed on the two adjacent pipe sections, the stepped surface of the inner side wall of the hoop is respectively attached to the outer wall surface of the inner and outer pipe sections, and the protruding block of the stepped surface is clamped in the hoop limiting groove on the outer wall of the inner pipe section, and the hoop is locked and connected at the connecting position of the two adjacent pipe sections by the hoop bolt.

[0017] Further, the steel column construction method for the one-column-one-pile process under low clearance conditions is provided, and a plumb device is installed on the telescopic sleeve before the telescopic sleeve is connected with the steel reinforcement cage.

[0018] Compared with the prior art, the beneficial effects of the present application are as follows:

[0019] The steel column and the construction method thereof for the one-column-one-pile process under low clearance conditions are provided, the telescopic sleeve is used, the telescopic sleeve is transported to the existing building in a contracted state before installation, so that the steel column is constructed under the low clearance condition of the existing building, and the occupied construction site space is reduced compared with the stacking of the segmented steel column on the ground space before welding.

[0020] The steel stand column and the construction method thereof in the one-column one-pile process under low clearance conditions are provided, when two adjacent pipe sections are elongated to the connecting position, the spring lock bead is clamped in the lock bead limiting groove to limit and connect the two adjacent pipe sections, so that the two adjacent pipe sections are not disconnected after elongation; the anchor bolt is connected in the bolt hole penetrating through the inner and outer pipe sections at the connecting position of the two adjacent pipe sections, so that the two adjacent pipe sections are locked and connected, thereby ensuring the reliability of the connection of the two adjacent pipe sections, avoiding the problem that the spring lock bead of the two adjacent pipe sections is disconnected from the lock bead limiting groove due to the gravity of the telescopic sleeve during the lowering and elongation process, and the anchor bolt can also improve the shear resistance between the two adjacent pipe sections; the hoop is installed on the outer wall surface of the two adjacent pipe sections, so as to ensure the bending resistance of the two adjacent pipe sections, avoid the problem that the two adjacent pipe sections are bent at the connecting position when there is a gap between the inner and outer sleeves of the two adjacent pipe sections, and the hoop also ensures the perpendicularity of the connection of the two adjacent pipe sections, and improves the construction quality of the steel stand column.

[0021] The steel stand column and the construction method thereof in the one-column one-pile process under low clearance conditions are provided, the telescopic sleeve, the anchor bolt and the hoop are used to complete the construction of the steel stand column in the one-column one-pile process of the top-down method under the low clearance condition in the existing building, welding is not required, the fire operation is reduced, and the construction safety is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the elevation structure schematic view of the steel stand column in the one-column one-pile process under low clearance conditions in the contraction state provided by the embodiment of the application;

[0023] Figure 2 is Figure 1 is the enlarged view of the lock bead limiting groove node in the steel stand column in the one-column one-pile process under low clearance conditions;

[0024] Figure 3 is the elevation structure schematic view of the steel stand column in the one-column one-pile process under low clearance conditions in the elongation state provided by the embodiment of the application;

[0025] Figure 4 is Figure 3 is the enlarged view of the connecting position of the two adjacent pipe sections in the steel stand column in the one-column one-pile process under low clearance conditions;

[0026] Figure 5 is the elevation structure schematic view of the hoop;

[0027] Figure 6 is the plane structure schematic view of the hoop;

[0028] Figure 7 is the process schematic view of transporting the steel stand column into the existing building;

[0029] Figure 8is the process diagram of the steel column in the contraction state connected with the reinforcement cage and then put into the hole as a whole;

[0030] Figure 9 is the process diagram of the anchor pipe section of the steel column put down to be limited by the spring lock ball at the connection with the adjacent intermediate pipe section;

[0031] Figure 10 is Figure 9 is the enlarged view of A in the middle;

[0032] Figure 11 is the process diagram of the anchor pipe section of the steel column put down to be in sliding extension relationship with the adjacent intermediate pipe section;

[0033] Figure 12 is Figure 11 is the enlarged view of B in the middle;

[0034] Figure 13 is the process diagram of the anchor pipe section of the steel column put down to be limited by the spring lock ball at the connection with the lower end of the adjacent intermediate pipe section;

[0035] Figure 14 is the process diagram of the anchor pipe section of the steel column in the extension state and the installation of the hoop at the connection with the adjacent intermediate pipe section;

[0036] Figure 15 is Figure 14 is the enlarged view of C in the middle;

[0037] Figure 16 is the process diagram of the anchor pipe section of the steel column in the extension state and the installation of the anchor bolt at the connection with the adjacent intermediate pipe section;

[0038] Figure 17 is the process diagram of the steel column sinking to the design elevation, the pipe sections in the extension state and connected by the hoop and the anchor bolt at the connection of the adjacent pipe sections;

[0039] Figure 18 is the elevation structure diagram of the underground space constructed by the steel column and the reinforcement cage;

[0040] shown in the figure:

[0041] 1, steel column;

[0042] 100, telescopic sleeve, 101, anchor pipe section, 102, intermediate pipe section, 103, hoisting pipe section, 104, water stop steel plate, 105, hoisting hole, 106, spring lock ball, 107, lock ball limiting groove, 108, bolt hole, 109, hoop limiting groove, 110, through hole;

[0043] 200, anchor bolt;

[0044] 300, clamp; 301, half clamp; 302, clamp bolt; 303, stepped surface; 304, protrusion.

[0045] 2. Reinforcing cage;

[0046] 3. Pile holes;

[0047] 4. Existing buildings;

[0048] 5. Underground space. Detailed Implementation

[0049] The present invention will now be described in detail with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0050] Please refer to Figures 1 to 6 This invention provides a steel column 1 for use in a one-column-one-pile process under low headroom conditions, comprising a telescopic sleeve 100, an anchor bolt 200, and a clamp 300, wherein:

[0051] The telescopic sleeve 100 comprises multiple pipe segments nested and connected with each other in a telescopic manner from outside to inside. The outermost pipe segment is an anchoring pipe segment 101, the innermost pipe segment is a hoisting pipe segment 103, and the pipe segments between the innermost and outermost pipe segments are intermediate pipe segments 102. The upper end of the hoisting pipe segment 103 is symmetrically provided with a hoisting hole 105. When the telescopic sleeve 100 is in a contracted state, the inner pipe segments are sequentially contracted in the adjacent outer pipe segments. When the telescopic sleeve 100 is in an elongated state, the inner pipe segments are extended from the adjacent outer pipe segments. A plurality of spring lock beads 106 are embedded on the inner wall of the outer pipe segment at the connection between the two adjacent pipe segments and are uniformly distributed along the cross section. A plurality of lock bead limiting grooves 107 are provided on the outer wall of the inner pipe segment at the connection between the two adjacent pipe segments and are uniformly distributed along the cross section. When the two adjacent pipe segments are elongated to the connection, the spring lock beads 106 are clamped in the lock bead limiting grooves 107 to limit and connect the two adjacent pipe segments. When the two adjacent pipe segments are retracted from the connection, the spring lock beads 106 slide out of the lock bead limiting grooves 107 to contract the inner pipe segment in the outer pipe segment. A plurality of bolt holes 108 are provided on the inner and outer pipe segments at the connection between the two adjacent pipe segments. A plurality of hoop limiting grooves 109 are provided on the outer wall of the inner pipe segment at the connection between the two adjacent pipe segments and are uniformly distributed along the cross section. The intermediate pipe segments 102 are not limited to one segment and can be multiple segments nested and connected in a telescopic manner. Two intermediate pipe segments 102 are shown in the figure, but the number of intermediate pipe segments is not limited to two and can be appropriately increased or decreased according to the needs of underground space development. The telescopic sleeve 100 shown in the figure is four pipe segments, but the number of pipe segments is not limited to four. The spring lock beads 106 comprise springs and connected beads in blind holes provided on the inner wall of the outer pipe segment. The beads are partially limited outside the blind holes and partially limited inside the blind holes. The beads are retracted in the blind holes by the spring force of the springs or partially limited outside the blind holes.

[0052] The anchor bolt 200 is a plurality of anchor bolts. When the two adjacent pipe segments are elongated to the connection, the anchor bolt 200 is used to be connected in the bolt hole 108 provided on the inner and outer pipe segments at the connection between the two adjacent pipe segments to lock and connect the two adjacent pipe segments.

[0053] The hoop 300 is a plurality of hoops. When the two adjacent pipe segments are elongated to the connection, the hoop 300 is used to be installed on the outer wall surface of the two adjacent pipe segments and locked and connected by the hoop bolt 302. The inner wall of the hoop 300 is a stepped surface 303 which is respectively fitted on the outer wall surface of the inner pipe segment and the outer pipe segment. The stepped surface 303 is provided with a plurality of protrusions 304 which are matched with the hoop limiting groove 109 on the surface of the inner pipe segment. The hoop 300 is composed of two half hoops 301 which are connected at both ends and locked and connected by the hoop bolt 302.

[0054] Please refer to Figures 7 to 18The embodiment of the present application also provides a steel stand column construction method for the steel stand column in the one-column-one-pile process under low clearance conditions, which adopts the steel stand column 1 for the steel stand column in the one-column-one-pile process under low clearance conditions, and comprises the following steps:

[0055] In step S401, after the pile hole 3 is constructed in the lowermost building of the existing building 4 and the reinforcement cage 2 is lowered, the telescopic sleeve 100 in the contracted state is transported into the lowermost building, the telescopic sleeve 100 in the contracted state is connected to the hoisting equipment through the upper hoisting hole 105, and the telescopic sleeve 100 in the contracted state is connected to the reinforcement cage 2 through the anchoring pipe section 101. The length of the telescopic sleeve 100 in the contracted state is short, the requirement for the net height of the construction site is low, and the telescopic sleeve 100 is suitable for construction under low clearance conditions in the existing building. The connection between the anchoring pipe section 101 of the telescopic sleeve 100 and the reinforcement cage 2 can be welding. In order to ensure the perpendicularity of the telescopic sleeve 100, a plumb device can be installed on the telescopic sleeve 100 before the telescopic sleeve 100 is connected to the reinforcement cage 2, so that the telescopic sleeve 100 is connected to the reinforcement cage 2 after the perpendicularity of the telescopic sleeve 100 is adjusted, and the perpendicularity of the telescopic sleeve 100 is ensured. The plumb device comprises a laser inclinometer support and a laser inclinometer thereon. The perpendicularity of the telescopic sleeve 100 is measured by the laser inclinometer.

[0056] In step S402, the reinforcement cage 2 and the telescopic sleeve 100 connected thereto are lowered along the pile hole 3, in the lowering process, each pipe section is sunk from outside to inside, when the two adjacent pipe sections are elongated to the connection position, the two adjacent pipe sections are limitedly connected by the spring lock bead 106 which is clamped in the lock bead limiting groove 107, the two adjacent pipe sections are locked by the anchor bolt 200 which is connected to the bolt holes 108 in the inner and outer pipe sections at the connection position of the two adjacent pipe sections, the clamping hoop 300 is installed on the two adjacent pipe sections, the inner wall of the clamping hoop 300 is respectively attached to the outer wall of the inner and outer pipe sections, the protrusion 304 of the clamping hoop 300 is clamped in the clamping hoop limiting groove 109 on the outer wall of the inner pipe section, and the clamping hoop 300 is locked at the connection position of the two adjacent pipe sections by the clamping hoop bolt 302.

[0057] Please refer to Figure 7 and Figure 18The steel stand column 1 and the construction method thereof in the one-column-one-pile process under low-clearance conditions provided by the embodiment of the present application adopt the telescopic sleeve 100, and the telescopic sleeve 100 is transported to the existing building 4 in a contracted state before installation, so that the steel stand column 1 is constructed under the low-clearance condition of the existing building 4, and compared with the stacking of the segmented steel stand column 1 on the ground space before welding, the telescopic sleeve 100 has the advantage of reducing the occupation of the construction site space; the telescopic sleeve 100 can transport and align the pipe segments of the steel stand column 1 integrally at one time, in the lengthening construction of the steel stand column 1, the lengthening of the adjacent two pipe segments is realized through the telescopic relationship between the inner and outer sleeves, the adjacent two pipe segments are limited from disconnection through the spring lock beads 106, the reliability of the connection of the adjacent two pipe segments is ensured through the anchor bolts 200, the perpendicularity of the adjacent two pipe segments is ensured through the hoops 300, the lengthening of all the pipe segments is realized through the telescopic adjustment of all the sleeves, and then the steel stand column 1 meets the length design requirement, and compared with the transportation, alignment and welding connection of the segmented steel stand column 1, the lengthening construction of the telescopic sleeve 100 is convenient and fast, the construction efficiency is high, and the cost is low.

[0058] Please refer to Figure 2 and Figure 17 The steel stand column 1 and the construction method thereof in the one-column-one-pile process under low-clearance conditions provided by the embodiment of the present application, when the adjacent two pipe segments are lengthened to the connection position, the adjacent two pipe segments are connected and limited through the spring lock beads 106 clamped in the lock bead limiting grooves 107, so that the adjacent two pipe segments are not disconnected after lengthening; the adjacent two pipe segments are connected and locked through the anchor bolts 200 penetratingly connected in the bolt holes 108 penetratingly arranged on the inner and outer pipe segments at the connection position of the adjacent two pipe segments, so as to ensure the reliability of the connection of the adjacent two pipe segments, and avoid the problem that the spring lock beads 106 of the adjacent two pipe segments are disconnected from the lock bead limiting grooves 107 due to the gravity of the telescopic sleeve 100 in the lengthening process, wherein the anchor bolts 200 can also improve the shear resistance between the adjacent two pipe segments; the hoops 300 are installed on the outer wall surfaces of the adjacent two pipe segments, so as to ensure the bending resistance of the adjacent two pipe segments, avoid the problem that the adjacent two pipe segments are bent at the connection position when there is a gap between the inner and outer sleeves of the adjacent two pipe segments, and ensure the perpendicularity of the connection of the adjacent two pipe segments through the hoops 300, and improve the construction quality of the steel stand column 1.

[0059] The steel stand column 1 and the construction method thereof in the one-column-one-pile process under low-clearance conditions provided by the embodiment of the present application realize the construction of the steel stand column 1 in the top-down method one-column-one-pile process under the low-clearance condition in the existing building 4 through the telescopic sleeve 100, the anchor bolt 200 and the hoop 300, without welding, reducing the fire operation, and improving the construction safety.

[0060] Please refer to Figure 1In order to improve the water stop effect, the steel stand column 1 and the construction method thereof in the one-column one-pile process under low clearance conditions are provided, and a water stop steel plate 104 is arranged around the anchor pipe section 101.

[0061] Please refer to Figure 3 In order to realize the telescopic connection of adjacent pipe sections, the steel stand column 1 and the construction method thereof in the one-column one-pile process under low clearance conditions are provided, and each pipe section is a square steel pipe. In order to reduce the cost, a plurality of through holes 110 are longitudinally arranged on the pipe body between the connecting portions of each pipe section, and each through hole 110 is uniformly distributed and has the same number along the cross section. That is, when the pipe section is a square steel pipe, each through hole at each horizontal position includes through holes 110 distributed on the four surfaces of the steel pipe. In order to improve the structural strength of the pipe section, each pipe section with the through hole 110 and the water stop steel plate 104 are integrally formed.

[0062] Please refer to Figure 1 and Figure 3 In order to improve the reliability of the connection between the connecting portions of adjacent pipe sections, the steel stand column 1 and the construction method thereof in the one-column one-pile process under low clearance conditions are provided, and the bolt holes 108 penetrating the inner and outer pipe sections at the connecting portions of adjacent pipe sections are arranged in a row-column matrix. Then, the anchor bolts 200 arranged in a row-column matrix are connected through the bolt holes 108 arranged in a row-column matrix, so as to improve the reliability of the connection between adjacent pipe sections and the shear resistance.

[0063] Please refer to Figure 2 In order to facilitate the telescopic adjustment of adjacent pipe sections, the steel stand column 1 and the construction method thereof in the one-column one-pile process under low clearance conditions are provided, and the upper edge of the lock bead limiting groove 107 has an upwardly inclined guide angle. When the inner and outer sleeves are relatively elongated, the guide angle facilitates the sliding of the spring lock bead 106 into the lock bead limiting groove 107, or facilitates the sliding of the spring lock bead 106 out of the lock bead limiting groove 107, so as to have a smooth telescopic adjustment effect and avoid jamming.

[0064] Please refer to Figure 1 , Figures 3 to 4 In order to avoid interference during the installation of the hoop 300, the anchor bolt 200 and the lock bead limiting groove 107, and to improve the reliability of the connection of the hoop 300 and the anchor bolt 200, the steel stand column 1 and the construction method thereof in the one-column one-pile process under low clearance conditions are provided, and the hoop limiting groove 109, the lock bead limiting groove 107 and the bolt hole 108 are distributed in a staggered manner. The positional relationship between the hoop limiting groove 109, the lock bead limiting groove 107 and the bolt hole 108 is shown in the figure, which is staggered in an upper-middle-lower manner, but is not limited to the upper-lower staggered manner, and can also be staggered in a transverse cross-sectional direction.

[0065] The present application is not limited to the above-described specific embodiments, and it is obvious that the above-described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application. Those of ordinary skill in the art can make other levels of modifications and changes to the present application. Thus, if these modifications and changes of the present application belong to the scope of the claims of the present application, the present application also intends to include these modifications and changes.

Claims

1. A steel column used in a one-column-one-pile process under low headroom conditions, characterized in that, Includes expansion sleeves, anchor bolts, and clamps, among which: The telescopic sleeve comprises multiple nested and telescopically connected pipe sections from the outside in. The outermost pipe section is the anchoring section, and the innermost pipe section is the lifting section. The upper end of the lifting section is symmetrically provided with lifting holes. The pipe section between the innermost and outermost sections is the intermediate section. When the telescopic sleeve is in the retracted state, the innermost pipe sections retract sequentially into their adjacent outermost pipe sections. When the telescopic sleeve is in the extended state, the innermost pipe sections extend from their adjacent outermost pipe sections. Multiple spring-loaded locking balls, evenly distributed along the cross-section, are embedded in the inner wall of the outermost pipe section at the connection point between adjacent pipe sections. The inner pipe section at the connection of two adjacent pipe sections has multiple locking ball limiting grooves evenly distributed along the cross-section on its outer wall. When the two adjacent pipe sections extend to the connection, the spring locking balls are engaged in the locking ball limiting grooves to limit the connection between the two adjacent pipe sections. When the two adjacent pipe sections retract from the connection, the spring locking balls slide out from the locking ball limiting grooves to retract the inner pipe section into the outer pipe section. Multiple bolt holes are provided through the inner and outer pipe sections at the connection of two adjacent pipe sections. The inner pipe section at the connection of two adjacent pipe sections has clamp limiting grooves evenly distributed along the cross-section on its outer wall. Anchor bolts, which are multiple, are used to lock the two adjacent pipe sections together when they extend to the connection point. They are inserted through bolt holes on the inner and outer pipe sections at the connection point of the two adjacent pipe sections. Multiple clamps are used to install on the outer wall of adjacent pipe sections when they extend to the connection point and are locked together by clamp bolts. The inner wall of the clamp is a stepped surface that fits onto the outer wall of the inner and outer pipe sections respectively. The stepped surface has multiple protrusions that match the clamp's limiting groove on the surface corresponding to the inner pipe section.

2. The steel column used in the one-column-one-pile process under low headroom conditions according to claim 1, characterized in that, A water-stop steel plate is installed around the anchored pipe section.

3. The steel column for one-column-one-pile construction under low headroom conditions as described in claim 1, characterized in that, Each section of the pipe is made of square steel pipe.

4. The steel column used in the one-column-one-pile process under low headroom conditions according to claim 1, characterized in that, The bolt holes penetrating the inner and outer pipe sections at the connection between two adjacent pipe sections are distributed in a row and column matrix.

5. The steel column for one-column-one-pile construction under low headroom conditions as described in claim 1, characterized in that, The locking ball limiting groove has an upwardly inclined chamfer.

6. The steel column for one-column-one-pile construction under low headroom conditions as described in claim 1, characterized in that, The clamp limiting groove, the locking bead limiting groove, and the bolt hole are staggered.

7. The steel column for one-column-one-pile construction under low headroom conditions as described in claim 1, characterized in that, Several through holes are longitudinally spaced on the pipe body between the joints of each pipe section. Each through hole consists of multiple holes that are evenly distributed along its cross-section and are of the same number.

8. A method for constructing steel columns in a one-column-one-pile process under low headroom conditions, characterized in that, The steel column used in the one-column-one-pile process under low headroom conditions according to any one of claims 1-7 comprises: After drilling pile holes and lowering the steel cage in the lowest floor of the existing building, the telescopic sleeve in the contracted state is transported to the lowest floor. The telescopic sleeve in the contracted state is connected to the hoisting equipment through the hoisting hole on it. The telescopic sleeve in the contracted state is connected to the steel cage through the anchor pipe section. The reinforcing cage and its connecting expansion sleeve are lowered along the pile hole. During the lowering process, each pipe section is lowered section by section from the outside to the inside. When two adjacent pipe sections extend to the connection point, they are locked in the locking ball groove by spring locking balls to limit the connection between the two adjacent pipe sections. Anchor bolts are connected through the bolt holes on the inner and outer pipe sections at the connection point of the two adjacent pipe sections to lock the connection between the two adjacent pipe sections. Clamps are installed on the two adjacent pipe sections, so that the stepped surface of the inner wall of the clamp is respectively attached to the outer wall of the inner and outer pipe sections, and the protrusion of the stepped surface is locked in the clamp limiting groove on the outer wall of the inner pipe section. The clamp is locked in the connection between the two adjacent pipe sections by clamp bolts.

9. The steel column construction method for one-column-one-pile construction under low headroom conditions according to claim 8, characterized in that, Before connecting the expansion sleeve to the reinforcing cage, install a plumb adjustment device on the expansion sleeve.

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