Underground engineering steel pipe column construction method and positioning device

Abstract

The invention discloses an underground engineering steel pipe column construction method. The method comprises the steps that a pile casing is inserted into the top of a stratum; drilling is conducted in the pile casing; the pile reinforcement cage is lowered into the pile hole, and the pile reinforcement cage is hung on the carrying pole beam through the first hanging bars; the positioning device is placed over the pile casing; the tool column and the steel pipe column are coaxially and fixedly connected; and one end of the second hanging bar and one end of the third hanging bar are fixed to the tool column, the tool column is hung through the third hanging bar, the steel pipe column is hung into the positioning device, the bottom end of the steel pipe column is inserted into the pile reinforcement cage by the preset depth, and then the second hanging bar is connected with the first hanging bar. The invention further discloses a positioning device of the underground engineering steel pipe column. The positioning device is used for achieving the underground engineering steel pipe column construction method. According to the underground engineering steel pipe column construction method and the positioning device, the positioning precision of the steel pipe column is improved, the perpendicularity control precision requirement of the steel pipe column is met, and the stability of the steel pipe column after positioning and the stability in the follow-up pouring process are improved.

Description

Technical Field

[0001] The invention relates to the technical field of underground engineering steel pipe column construction, and in particular to an underground engineering steel pipe column construction method and a positioning device. Background Art

[0002] With the large-scale construction of underground projects, a large number of ground construction surfaces are becoming less and less. Underground projects are increasingly built in areas with poor geological conditions and construction risks. In order to save ground construction space and improve the construction safety of underground projects, more and more underground projects adopt the overall reverse construction process of the steel pipe column support system, such as the deep foundation pit underground structure reverse construction steel pipe column positioning device and positioning construction method disclosed with application number 201910864018.9, including a rectangular base, a support frame movably arranged on the base, a positioning assembly arranged on the support frame, and a rectangular working platform. A first working hole matching the pile hole diameter is opened on the base, and the support frame includes a rectangular base at the bottom, four columns whose lower ends are fixed at four right angles of the rectangular base, and two "T"-shaped brackets respectively connected to two opposite sides of the rectangular base, the upper ends of the four columns are connected to the working platform, and the positioning assembly is arranged on the two brackets. At present, the existing steel pipe column construction process still faces many problems: first, the positioning control accuracy of the steel pipe column is insufficient, especially the control of verticality, which cannot meet the 1 / 1000 control standard in the design specification; second, the steel cage is lowered into place first, and then the steel pipe column is lowered. It is difficult to effectively connect the steel pipe column and the steel cage. During the lowering of the steel cage, when the bottom sediment or the hole wall collapses, the steel cage is difficult to put to the design elevation, and the posture of the steel cage is also difficult to be vertical, resulting in the difficulty of inserting the steel pipe column lowered later into the steel cage. If forced to insert, either the steel pipe column and the steel cage are stuck and the lowering is unsuccessful, or the steel pipe column crushes the steel cage, and finally causes damage to both the steel pipe column and the steel cage; third, the concrete grades of the steel pipe column and the pile under the column are generally different. Conventionally, the bottom of the steel pipe column is closed, and the concrete of the pile and the steel pipe column is not connected, that is, the pile concrete is poured first, and then the steel pipe column is inserted into the pile, which leads to a long overall construction time. If the pile concrete solidifies, the steel pipe column is often unable to be inserted, resulting in waste piles and huge economic losses. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method and a positioning device for underground engineering steel pipe column construction that improves the positioning accuracy of steel pipe columns, meets the verticality control accuracy requirements of steel pipe columns, avoids the problem of difficulty in aligning and forming an effective connection caused by lowering the steel cage first and then the steel pipe column, and improves the stability of the steel pipe column after positioning and the stability during subsequent pouring.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A method for constructing a steel pipe column in an underground project is carried out by using a steel pipe column construction system in an underground project. The steel pipe column construction system in an underground project includes a positioning device, a casing, a shoulder beam and a tool column. The positioning device includes a positioning frame. The middle part of the positioning frame forms a passage for the steel pipe column to pass through. At least two groups of clamping wall positioning mechanisms arranged at intervals along the axial direction are provided in the passage. The clamping wall positioning mechanisms are used to clamp the outer wall of the steel pipe column to position the steel pipe column. The positioning frame is provided with an openable and closable jacking mechanism above each clamping wall positioning mechanism. The jacking mechanism is used to close to lift the top of the steel pipe column. The method for constructing a steel pipe column in an underground project includes the following steps:

[0006] S1. Insert casing at the top of the formation;

[0007] S2, drilling holes in the casing until the depth of the pile hole reaches the construction depth requirement of the pile reinforcement cage;

[0008] S3, lowering the pile reinforcement cage into the pile hole, and suspending the pile reinforcement cage on the shoulder beam through the first suspension rod, with both ends of the shoulder beam placed on the ground around the casing;

[0009] S4. Place the positioning device just above the casing;

[0010] S5. Connect the tool column and the steel pipe column coaxially and fixedly;

[0011] S6, fix one end of the second hanging bar and one end of the third hanging bar on the tool column respectively, hang the tool column through the third hanging bar, hang the steel pipe column into the positioning device, and insert the bottom end of the steel pipe column into the preset depth of the pile reinforcement cage, and then connect the second hanging bar to the first hanging bar;

[0012] S7, clamping the steel pipe column by each clamping wall positioning mechanism;

[0013] S8. Check the plane position and verticality of the steel pipe column by external measuring equipment, and make the plane position and verticality of the steel pipe column meet the design requirements through the clamping and adjustment of each clamping wall positioning mechanism;

[0014] S9, recording the positioning position of each clamping wall positioning mechanism;

[0015] S10, loosen each clamping wall positioning mechanism to release the clamping effect on the steel pipe column, and then the third hanging rod continues to hang the tool column to lower the steel pipe column to the designed elevation;

[0016] S11, re-tightening each clamping wall positioning mechanism so that each clamping wall positioning mechanism clamps the tool column;

[0017] S12. Checking the plane position and verticality of the tool column by external measuring equipment, and adjusting the plane position and verticality of the tool column by clamping and adjusting the clamping wall positioning mechanisms to meet the design requirements;

[0018] S13. The jacking mechanism is closed to lift the top of the steel pipe column and the third suspension rod is released.

[0019] As a further improvement of the above technical solution:

[0020] The following steps are also included:

[0021] S14, hanging the catheter into the tool column;

[0022] S15, pouring pile concrete through the conduit until the pile concrete liquid level reaches the designed height below the bottom of the steel pipe column and then stopping pouring;

[0023] S16, pouring cage concrete through the conduit until the cage concrete liquid level reaches the top of the pile reinforcement cage and then stops;

[0024] S17, backfill the outer side of the steel pipe column with crushed stone until the crushed stone is backfilled to the designed height below the casing;

[0025] S18. Pour the concrete in the column through the conduit until the liquid level of the concrete in the steel pipe column reaches the top of the steel pipe column, and then stop pouring and remove the conduit.

[0026] The following steps are also included:

[0027] S19, hanging the column top steel cage into the tool column, and fixing the column top steel cage to the top of the concrete in the column;

[0028] S20, after the concrete in the column has finally set, remove the positioning device;

[0029] S21. Separate the tool column from the steel pipe column and lift out the tool column.

[0030] The following steps are also included:

[0031] S22. Backfill the soil into the pile hole to the ground, and then lift out the casing.

[0032] The bottom end of the tool column is provided with a grout overflow hole.

[0033] In the above S17, the backfill height of crushed stone is at least 4m.

[0034] The clamping wall positioning mechanism comprises a plurality of clamping wall hydraulic oil cylinders, one end of each of the clamping wall hydraulic oil cylinders is fixed on a positioning frame and arranged at intervals around the center of the passage, and the other end of each of the clamping wall hydraulic oil cylinders is provided with an arc-shaped tightening block.

[0035] The jacking mechanism includes two jacking blocks and two jacking hydraulic cylinders. The two jacking blocks are movably arranged on the positioning frame and are relatively arranged with the center of the travel channel as the symmetric center. The two jacking hydraulic cylinders are arranged on the positioning frame and are respectively connected to the two jacking blocks.

[0036] The positioning frame is provided with a working platform above the supporting mechanism, the side of the working platform is provided with a guardrail, and the four corners of the bottom of the positioning frame are provided with lifting and leveling support feet.

[0037] A positioning device for underground engineering steel pipe columns, used to implement the above-mentioned underground engineering steel pipe column construction method, including a positioning device, a casing, a shoulder beam and a tool column. The positioning device includes a positioning frame, the middle part of the positioning frame forms a travel channel for the steel pipe column to pass through, and at least two groups of axially spaced wall positioning mechanisms are arranged in the travel channel. The wall positioning mechanism is used to clamp the outer wall of the steel pipe column to position the steel pipe column. The positioning frame is provided with an openable and closable supporting mechanism above each wall positioning mechanism, and the supporting mechanism is used to engage to support the top of the steel pipe column.

[0038] Compared with the prior art, the advantages of the present invention are:

[0039] The underground engineering steel pipe column construction method of the present invention comprises the following steps: first, the steel pipe column and the tool column are axially positioned in sequence by means of the wall positioning mechanisms arranged at intervals along the axial direction of the passage, so that the plane position and verticality of the steel pipe column meet the design requirements, the positioning accuracy of the steel pipe column is improved, and the verticality control accuracy requirements of the steel pipe column are met; second, after the bottom end of the steel pipe column is inserted into the preset depth of the pile reinforcement cage, the second hanging bar is connected to the pile reinforcement cage, so that the steel pipe column and the pile reinforcement cage are lowered as a whole under the action of the second hanging bar tightening connection, that is, the steel pipe column and the pile reinforcement cage are first docked and then lowered as a whole, so as to avoid the problem of difficulty in aligning and forming an effective connection caused by lowering the pile reinforcement cage first and then the steel pipe column, thereby avoiding the problem of pressure loss of the steel pipe column and the pile reinforcement cage due to subsequent alignment; third, the steel pipe column is lowered after the tool column and the steel pipe column are fixed, and the positioning of the tool column and the positioning device are combined, so as to improve the stability of the steel pipe column after positioning, and also improve the stability of the steel pipe column during the subsequent pouring process.

[0040] The positioning device for underground engineering steel pipe columns of the present invention is used to implement an underground engineering steel pipe column construction method, which can improve the positioning accuracy of the steel pipe columns, meet the verticality control accuracy requirements of the steel pipe columns, and improve the stability of the steel pipe columns after positioning and the stability during the subsequent casting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the construction structure of S3 of the underground engineering steel pipe column construction method of the present invention.

[0042] Figure 2 It is a schematic diagram of the construction structure of S6 of the underground engineering steel pipe column construction method of the present invention.

[0043] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0044] Figure 4 yes Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0045] Figure 5 yes Figure 2 Schematic diagram of the enlarged structure at point C in the middle.

[0046] Figure 6 It is a schematic diagram of the construction structure of S13 of the underground engineering steel pipe column construction method of the present invention.

[0047] Figure 7 yes Figure 6 Schematic diagram of the enlarged structure at D in the middle.

[0048] Figure 8 It is a schematic diagram of the construction structure of S14 to S16 of the underground engineering steel pipe column construction method of the present invention.

[0049] Fig. 9 It is a schematic diagram of the construction structure of S17 of the underground engineering steel pipe column construction method of the present invention.

[0050] Fig.10 This is a schematic diagram of the structure after the main structure is completed.

[0051] Fig.11 It is a structural schematic diagram of a positioning device for underground engineering steel pipe columns of the present invention.

[0052] Fig.12 It is a structural schematic diagram of the wall clamping positioning mechanism of the positioning device for the underground engineering steel pipe column of the present invention.

[0053] Fig.13 It is a structural schematic diagram of the jacking mechanism of the positioning device of the underground engineering steel pipe column of the present invention.

[0054] The symbols in the figure represent:

[0055] 1. Stratum; 2. Positioning device; 21. Clamping wall positioning mechanism; 211. Clamping wall hydraulic cylinder; 212. Arc-shaped abutment block; 22. Lifting mechanism; 221. Lifting block; 222. Lifting hydraulic cylinder; 223. Track; 23. Passageway; 24. Lifting and leveling support foot; 25. Working platform; 26. Guardrail; 3. Casing; 4. Shoulder pole beam; 5. Pile reinforcement cage; 51. First lifting rod; 6. Steel pipe column; 61. Tool column; 611. First lifting lug; 612. Overflow hole; 613, ring beam; 614, anchor bolt; 62, second lifting ear; 63, vertical adjuster; 64, second hanging rod; 641, connector; 65, flange; 651, stiffening rib; 66, third hanging rod; 67, spacer; 71, cage concrete; 72, pile concrete; 8, conduit; 81, conduit pipe section; 82, hopper; 9, crushed stone; 10, column top steel cage; 11, soil; 12, main structure; 121, top plate; 122, middle plate; 123, bottom plate. DETAILED DESCRIPTION

[0056] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "assemble", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] Embodiment 1:

[0061] Figures 1 to 9 An embodiment of the underground engineering steel pipe column construction method of the present invention is shown. The underground engineering steel pipe column construction method of this embodiment is carried out by using an underground engineering steel pipe column construction system. The underground engineering steel pipe column construction system includes a positioning device 2, a casing 3, a shoulder beam 4 and a tool column 61. The positioning device 2 includes a positioning frame. The middle part of the positioning frame forms a passage 23 for the steel pipe column 6 to pass through. At least two groups of clamping wall positioning mechanisms 21 arranged at intervals along the axial direction are provided in the passage 23. The clamping wall positioning mechanisms 21 are used to clamp the outer wall of the steel pipe column 6 to position the steel pipe column 6. The positioning frame is provided with an openable and closable supporting mechanism 22 above each clamping wall positioning mechanism 21. The supporting mechanism 22 is used to close to support the top of the steel pipe column 6. The underground engineering steel pipe column construction method includes the following steps:

[0062] S1, insert casing 3 at the top of formation 1, such as Figure 1 As shown;

[0063] S2, drilling into the casing 3 until the depth of the pile hole reaches the construction depth requirement of the pile reinforcement cage 5, such as Figure 1 and Figure 6 As shown;

[0064] S3, lower the pile reinforcement cage 5 into the pile hole, and suspend the pile reinforcement cage 5 on the shoulder beam 4 through the first suspension rod 51, and the two ends of the shoulder beam 4 are placed on the ground around the casing 3, such as Figure 1 As shown;

[0065] S4, place the positioning device 2 just above the casing 3, as shown in Figure 2 As shown;

[0066] S5, the tool column 61 is coaxially fixedly connected with the steel pipe column 6, such as Figure 2 As shown; the bottom end of the tool column 61 and the top end of the steel pipe column 6 can be connected by a flange 65. Specifically, the bottom end of the tool column 61 and the flange 65 at the top end of the steel pipe column 6 are connected by bolts. More preferably, stiffening ribs 651 are provided between the tool column 61 and its flange 65, and between the steel pipe column 6 and its flange 65 to improve strength.

[0067] S6, fix one end of the second hanging bar 64 and one end of the third hanging bar 66 on the tool column 61 respectively, hang the tool column 61 through the third hanging bar 66, hang the steel pipe column 6 into the positioning device 2, and insert the bottom end of the steel pipe column 6 into the pile reinforcement cage 5 to a preset depth, and then connect the second hanging bar 64 to the first hanging bar 51, as shown in FIG. Figure 2As shown; preferably, the tool column 61 is provided with a first lifting lug 611 and a second lifting lug 62, one end of the third lifting bar 66 is connected to the first lifting lug 611, one end of the second lifting bar 64 is connected to the second lifting lug 62, and the tool column 61 lifts the pile reinforcement cage 5 through the connected second lifting bar 64 and the first lifting bar 51. More preferably, the second lifting bar 64 and the first lifting bar 51 are connected through a connector 641.

[0068] S7, clamping the steel pipe column 6 by each clamping wall positioning mechanism 21;

[0069] S8. The plane position and verticality of the steel pipe column 6 are checked by external measuring equipment, and the plane position and verticality of the steel pipe column 6 meet the design requirements through the clamping and adjusting action of each clamping wall positioning mechanism 21; the external measuring equipment includes a plumbness adjuster 63, and the plumbness adjuster 63 is installed on the steel pipe column 6 to measure the plane position and verticality of the steel pipe column 6.

[0070] S9, recording the positioning position of each clamping wall positioning mechanism 21;

[0071] S10, loosen each clamping wall positioning mechanism 21 to release the clamping effect on the steel pipe column 6, and then the third hanging rod 66 continues to hang the tool column 61 (remove the shoulder beam 4 before hanging), and lower the steel pipe column 6 to the designed elevation;

[0072] S11, re-tighten each clamping wall positioning mechanism 21, so that each clamping wall positioning mechanism 21 clamps the tool column 61;

[0073] S12, checking the plane position and verticality of the tool column 61 by external measuring equipment, and adjusting the plane position and verticality of the tool column 61 by the clamping and adjusting action of each clamping wall positioning mechanism 21, so that the plane position and verticality of the tool column 61 meet the design requirements;

[0074] S13, the supporting mechanism 22 is closed to support the top of the steel pipe column 6, and the third suspension rod 66 is loosened. Figure 6 shown.

[0075] The construction method of the underground engineering steel pipe column is as follows: first, the steel pipe column 6 and the tool column 61 are successively axially positioned by the wall positioning mechanisms 21 arranged at intervals along the axial direction of the passage 23, so that the plane position and verticality of the steel pipe column 6 meet the design requirements, the positioning accuracy of the steel pipe column 6 is improved, and the verticality control accuracy requirements of the steel pipe column 6 are met; second, after the bottom end of the steel pipe column 6 is inserted into the pile reinforcement cage 5 to a preset depth, the second hanging rod 64 is connected to the pile reinforcement cage 5, so that the steel pipe column 6 and the pile reinforcement cage 5 are tightened and connected at the second hanging rod 64 That is to say, the steel pipe column 6 and the pile reinforcement cage 5 are first connected and then lowered as a whole, so as to avoid the problem that the pile reinforcement cage 5 is lowered first and then the steel pipe column 6 is lowered, which is difficult to align and form an effective connection, thereby avoiding the problem of pressure loss of the steel pipe column 6 and the pile reinforcement cage 5 due to subsequent alignment; thirdly, the steel pipe column 6 is lowered after the tool column 61 is fixed to the steel pipe column 6, and the positioning combination of the tool column 61 and the positioning device 2 is improved, so as to improve the stability of the steel pipe column 6 after positioning, and also improve the stability of the steel pipe column 6 during the subsequent pouring process.

[0076] Furthermore, in this embodiment, if Figure 8 As shown, the following steps are also included:

[0077] S14, hanging the catheter 8 into the tool column 61;

[0078] S15, pouring the pile concrete 72 through the conduit 8, and stopping the pouring after the liquid level of the pile concrete 72 reaches the designed height below the bottom surface of the steel pipe column 6;

[0079] S16, pouring cage concrete 71 through the conduit 8, and stopping after the liquid level of cage concrete 71 reaches the top of the pile reinforcement cage 5;

[0080] S17, backfilling the crushed stone 9 outside the steel pipe column 6 until the crushed stone 9 is backfilled to the designed height below the casing 3 and then stopping;

[0081] S18, pouring the concrete in the column through the conduit 8 until the liquid level of the concrete in the steel pipe column 6 reaches the top of the steel pipe column 6, then stop and take out the conduit 8.

[0082] First, the pile concrete 72 is poured to the designed height below the bottom surface of the steel pipe column 6 through S15, and then the cage concrete 71 is poured at the position of the pile reinforcement cage 5 and inside and outside the steel pipe column 6 in the pile reinforcement cage 5 at the same time through S16, so as to avoid the problems of difficulty in insertion and poor connectivity caused by pouring the pile wall first and then inserting the steel pipe column 6, thereby improving the integrity of the steel pipe column 6 and the pile, and greatly shortening the overall pouring time of the steel pipe column 6 and the pile.

[0083] The concrete includes cage concrete 71 and pile concrete 72. Before pouring the pile concrete 72, the conduit 8 needs to be passed through the steel pipe column 6 until the bottom of the pile reinforcement cage 5. Preferably, the conduit 8 is spliced ​​by conduit pipe sections 81, and a hopper 82 is installed on the top of the conduit 8. Pour the pile concrete 72 first. When the liquid level at the top of the pile concrete 72 is below the designed height below the bottom of the steel pipe column 6, pour the cage concrete 71. The cage concrete 71 is first poured to the top elevation of the pile reinforcement cage 5, and then backfill the crushed stone 9 outside the steel pipe column 6. The backfill height is not less than 4m. The backfill height of the crushed stone 9 must ensure that it can balance the pressure after the concrete pouring in the column is completed. Finally, all the concrete in the column is poured at one time.

[0084] Furthermore, in this embodiment, if Fig. 9 As shown, the following steps are also included:

[0085] S19, hoist the column top reinforcement cage 10 into the tool column 61, and fix the column top reinforcement cage 10 to the top of the concrete in the column; the concrete in the column is preferably the same concrete as the cage concrete 71.

[0086] S20, after the concrete in the column is finally set, remove the positioning device 2;

[0087] S21, separate the tool column 61 from the steel pipe column 6, and lift out the tool column 61.

[0088] Furthermore, in this embodiment, the following steps are also included:

[0089] S22, backfill soil 11 into the pile hole to the ground, and then lift out the casing 3.

[0090] After the concrete pouring in the column is completed, the column top steel cage 10 is suspended from the tool column 61 to ensure that a part of the column top steel cage 10 is inserted into the concrete in the column, and the insertion depth meets the anchoring force requirements. After the concrete in the column is finally set, the positioning device 2 is removed, and the tool column 61 is separated from the steel pipe column 6, and then the tool column 61 is lifted out, and then the outer space of the steel pipe column 6 is completely backfilled with soil 11, and then the casing 3 is lifted out. The tool column 61 and the steel pipe column 6 are both tubular structures with a central through-hole.

[0091] Furthermore, in this embodiment, a grout overflow hole 612 is provided at the bottom end of the tool column 61 .

[0092] The overflow hole 612 is arranged at the bottom end of the tool column 61. The overflow hole 612 is preferably a semicircle with a diameter of 400 mm and is adjacent to the flange 65, so as to ensure that the over-filled concrete in the column overflows therefrom.

[0093] Furthermore, in this embodiment, in S17, the backfill height of the crushed stone 9 is at least 4 m. The backfill height of the crushed stone 9 must ensure that the pressure after the concrete pouring in the column is balanced.

[0094] Furthermore, in this embodiment, the wall positioning mechanism 21 includes a plurality of wall hydraulic cylinders 211, one end of each wall hydraulic cylinder 211 is fixed on the positioning frame and arranged around the center of the passage 23, and the other end of each wall hydraulic cylinder 211 is provided with an arc-shaped clamping block 212.

[0095] In the present embodiment, a total of two clamping wall positioning mechanisms 21 are arranged, which are distributed at the upper and lower parts of the positioning frame, and the vertical distance between the two clamping wall positioning mechanisms 21 is 2.8m. Among them, a frame is arranged outside the travel channel 23, which is square and has a cross-section of 200*200mm. A clamping wall hydraulic cylinder 211 is arranged at the center of each side of the frame, and every two clamping wall hydraulic cylinders 211 form a group. The maximum stroke of each clamping wall hydraulic cylinder 211 is 1000mm. The axis of each group of clamping wall hydraulic cylinders 211 must pass through the center of the travel channel 23, and each group of clamping wall hydraulic cylinders 211 is distributed symmetrically and mirror-image-wise along the center of the travel channel 23.

[0096] Furthermore, oblique rods are provided at the four corners of the frame, with a cross section of 200*200mm. An oblique hydraulic cylinder is provided at the center of the oblique rod, with a maximum cylinder stroke of 900mm. Every two oblique hydraulic cylinders form a group, and each group of oblique hydraulic cylinders is distributed along the center of the passage 23 in a mirror-symmetrical manner, and the axis of each group of oblique hydraulic cylinders passes through the center of the passage 23. Auxiliary tightening blocks are provided at the inner ends of the oblique hydraulic cylinders.

[0097] Furthermore, the arc-shaped abutting block 212 is arranged at the inner end of the clamped wall hydraulic cylinder 211, and the maximum stroke of each arc-shaped abutting block 212 is 200 mm. Every two arc-shaped abutting blocks 212 form a group, and each group of arc-shaped abutting blocks 212 is distributed along the center of the passage 23 in a mirror-symmetrical manner. A pad is arranged on the inner side of the arc-shaped abutting block 212, and the pad is made of a flexible material with a thickness of 50 mm.

[0098] Furthermore, in this embodiment, the jacking mechanism 22 includes two jacking blocks 221 and two jacking hydraulic cylinders 222. The two jacking blocks 221 are movably arranged on the positioning frame and are relatively arranged with the center of the travel channel 23 as the center of symmetry. The two jacking hydraulic cylinders 222 are arranged on the positioning frame and are respectively connected to the two jacking blocks 221.

[0099] Furthermore, in this embodiment, a track 223 is provided on the positioning frame, and the supporting block 221 is slidably arranged on the track 223. The track 223 has a cross section of 200*200mm, each track 223 is parallel to one side of the supporting hydraulic cylinder 222, and both ends of each track 223 are connected to the supporting hydraulic cylinder 222 to form a whole. Every two supporting blocks 221 form a group, and each supporting block 221 has a maximum stroke of 1000mm. Each group of supporting blocks 221 is symmetrically distributed along the center of the travel channel 23, and the center of each supporting block 221 is set on the corresponding supporting hydraulic cylinder 222.

[0100] Furthermore, in this embodiment, a working platform 25 is provided on the top of the jacking mechanism 22 of the positioning frame, a guardrail 26 is provided on the side of the working platform 25, and lifting and leveling legs 24 are provided at the four corners of the bottom of the positioning frame.

[0101] The lifting and leveling support legs 24 can level the positioning device 2 as a whole, and each lifting and leveling support leg 24 has a maximum stroke of 600mm to ensure the accurate positioning of the steel pipe column 6. Guardrails 26 are installed around the top of the working platform 25, and the height of the guardrails 26 is 1200mm to ensure the safety of personnel.

[0102] Further, in this embodiment, the diameter of the casing 3 is larger than the outer diameter of the pile reinforcement cage 5 and the steel pipe column 6, the height of the casing 3 is 4000mm, the diameter is 2000mm, the clearance between the casing 3 and the steel pipe column 6 must ensure that personnel can work, and the minimum clearance must be greater than 650mm. After the casing 3 is completed by the hole-making equipment, the casing 3 is lowered into the hole. The depth of the casing 3 must pass through the soft soil layer on the surface of the stratum 1 to prevent the hole from collapsing. The minimum height of the casing 3 is 2000mm. After the casing 3 is installed, the space inside the casing 3 is drilled, and the drilling depth must reach the depth requirement of the pile reinforcement cage 5. Then, the pile reinforcement cage 5 is hoisted into the hole position, and the first hanging rod 51 in the pile reinforcement cage 5 is hung on the shoulder beam 4. The shoulder beam 4 has a cross-section of 100*100mm, and the shoulder beam 4 is placed on the ground around the casing 3.

[0103] Furthermore, in this embodiment, the plumb meter 63 can be fixed to the top of the tool column 61, and can transmit signals wirelessly. When the bottom of the steel pipe column 6 is at the hole, the verticality of the steel pipe column 6 is adjusted by the positioning device 2, and then the verticality data of the plumb meter 63 is reset to zero, and then the steel pipe column 6 is lowered to the design elevation, and then the steel pipe column 6 is adjusted by the positioning device 2 to ensure that the verticality displayed by the plumb meter 63 meets the design requirements, and then the positioning of the steel pipe column 6 is completed. At this time, the gap between the first lifting ear 611 and the top support block 221 is filled by the pad 67, so that the steel pipe column 6 is suspended on the top support block 221.

[0104] Further, in this embodiment, in S13, the supporting mechanism 22 is close to support the top of the steel pipe column 6, and the third suspension rod 66 is loosened. Figure 6 After the two supporting blocks 221 are close together to clamp the steel pipe column 6, a cushion block 67 is placed between the supporting block 221 and the first lifting lug 611 to support the first lifting lug 611.

[0105] Furthermore, in this embodiment, the steel pipe column 6 is provided with a plurality of connection parts for connecting with the external structure arranged at intervals along the axial direction, and each connection part is provided with a ring beam 613 and an anchor bolt 614. After the construction method of the steel pipe column of the underground project is completed, the foundation pit of the underground project is excavated, and then the main structure 12 of the underground project is constructed, the inner ring beam 613 and the anchor bolt 614 of the steel pipe column 6 are cast into the bottom plate 123 and the middle plate 122, and the column top steel cage 10 is cast into the top plate 121, as shown in FIG. Fig.10 shown.

[0106] Embodiment 2:

[0107] Figures 11 to 13 An embodiment of the positioning device 2 for the underground engineering steel pipe column of the present embodiment is shown, which is used to implement the underground engineering steel pipe column construction method of embodiment 1, including the positioning device 2, the casing 3, the shoulder beam 4 and the tool column 61. The positioning device 2 includes a positioning frame, and the middle part of the positioning frame forms a travel channel 23 for the steel pipe column 6 to pass through. At least two groups of axially spaced wall positioning mechanisms 21 are arranged in the travel channel 23. The wall positioning mechanisms 21 are used to clamp the outer wall of the steel pipe column 6 to position the steel pipe column 6. The positioning frame is provided with an openable and closable supporting mechanism 22 above each wall positioning mechanism 21. The supporting mechanism 22 is used to engage to lift the top of the steel pipe column 6.

[0108] The positioning device 2 of the underground engineering steel pipe column is used to implement the underground engineering steel pipe column construction method, which can improve the positioning accuracy of the steel pipe column 6, meet the verticality control accuracy requirements of the steel pipe column 6, and improve the stability of the steel pipe column 6 after positioning and the stability during the subsequent pouring process.

[0109] Furthermore, in this embodiment, the wall positioning mechanism 21 includes a plurality of wall hydraulic cylinders 211, one end of each wall hydraulic cylinder 211 is fixed on the positioning frame and arranged around the center of the passage 23, and the other end of each wall hydraulic cylinder 211 is provided with an arc-shaped clamping block 212.

[0110] In the present embodiment, a total of two clamping wall positioning mechanisms 21 are arranged, which are distributed at the upper and lower parts of the positioning frame, and the vertical distance between the two clamping wall positioning mechanisms 21 is 2.8m. Among them, a frame is arranged outside the travel channel 23, which is square and has a cross-section of 200*200mm. A clamping wall hydraulic cylinder 211 is arranged at the center of each side of the frame, and every two clamping wall hydraulic cylinders 211 form a group. The maximum stroke of each clamping wall hydraulic cylinder 211 is 1000mm. The axis of each group of clamping wall hydraulic cylinders 211 must pass through the center of the travel channel 23, and each group of clamping wall hydraulic cylinders 211 is distributed symmetrically and mirror-image-wise along the center of the travel channel 23.

[0111] Furthermore, oblique rods are provided at the four corners of the frame, with a cross section of 200*200mm. An oblique hydraulic cylinder is provided at the center of the oblique rod, with a maximum cylinder stroke of 900mm. Every two oblique hydraulic cylinders form a group, and each group of oblique hydraulic cylinders is distributed along the center of the passage 23 in a mirror-symmetrical manner, and the axis of each group of oblique hydraulic cylinders passes through the center of the passage 23. Auxiliary tightening blocks are provided at the inner ends of the oblique hydraulic cylinders.

[0112] Furthermore, the arc-shaped abutting block 212 is arranged at the inner end of the clamped wall hydraulic cylinder 211, and the maximum stroke of each arc-shaped abutting block 212 is 200 mm. Every two arc-shaped abutting blocks 212 form a group, and each group of arc-shaped abutting blocks 212 is distributed along the center of the passage 23 in a mirror-symmetrical manner. A pad is arranged on the inner side of the arc-shaped abutting block 212, and the pad is made of a flexible material with a thickness of 50 mm.

[0113] Furthermore, in this embodiment, the jacking mechanism 22 includes two jacking blocks 221 and two jacking hydraulic cylinders 222. The two jacking blocks 221 are movably arranged on the positioning frame and are relatively arranged with the center of the travel channel 23 as the center of symmetry. The two jacking hydraulic cylinders 222 are arranged on the positioning frame and are respectively connected to the two jacking blocks 221.

[0114] Furthermore, in this embodiment, a track 223 is provided on the positioning frame, and the supporting block 221 is slidably arranged on the track 223. The track 223 has a cross section of 200*200mm, each track 223 is parallel to one side of the supporting hydraulic cylinder 222, and both ends of each track 223 are connected to the supporting hydraulic cylinder 222 to form a whole. Every two supporting blocks 221 form a group, and each supporting block 221 has a maximum stroke of 1000mm. Each group of supporting blocks 221 is symmetrically distributed along the center of the travel channel 23, and the center of each supporting block 221 is set on the corresponding supporting hydraulic cylinder 222.

[0115] Furthermore, in this embodiment, a working platform 25 is provided on the top of the jacking mechanism 22 of the positioning frame, a guardrail 26 is provided on the side of the working platform 25, and lifting and leveling legs 24 are provided at the four corners of the bottom of the positioning frame.

[0116] The lifting and leveling support legs 24 can level the positioning device 2 as a whole, and each lifting and leveling support leg 24 has a maximum stroke of 600mm to ensure the accurate positioning of the steel pipe column 6. Guardrails 26 are installed around the top of the working platform 25, and the height of the guardrails 26 is 1200mm to ensure the safety of personnel.

[0117] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for constructing a steel pipe column in an underground project, characterized in that: The underground engineering steel pipe column construction system is used, and the underground engineering steel pipe column construction system comprises a positioning device (2), a casing (3), a shoulder beam (4) and a tool column (61). The positioning device (2) comprises a positioning frame, and a passage (23) for the steel pipe column (6) to pass through is formed in the middle of the positioning frame. At least two groups of clamping wall positioning mechanisms (21) arranged at intervals along the axial direction are provided in the passage (23). The clamping wall positioning mechanisms (21) are used to clamp the outer wall of the steel pipe column (6) to position the steel pipe column (6). The positioning frame is provided with an openable and closable supporting mechanism (22) above each clamping wall positioning mechanism (21). The supporting mechanism (22) is used to be close to support the top of the steel pipe column (6). The underground engineering steel pipe column construction method comprises the following steps: S1, inserting a casing (3) at the top of the formation (1); S2, drilling a hole in the casing (3) until the depth of the pile hole reaches the construction depth requirement of the pile reinforcement cage (5); S3, lowering the pile reinforcement cage (5) into the pile hole, and suspending the pile reinforcement cage (5) on the shoulder beam (4) through the first suspension rod (51), with both ends of the shoulder beam (4) placed on the ground around the casing (3); S4, placing the positioning device (2) just above the casing (3); S5, coaxially and fixedly connecting the tool column (61) and the steel pipe column (6); S6, fix one end of the second hanging bar (64) and one end of the third hanging bar (66) on the tool column (61) respectively, hang the tool column (61) through the third hanging bar (66), hang the steel pipe column (6) into the positioning device (2), and insert the bottom end of the steel pipe column (6) into the pile reinforcement cage (5) to a preset depth, and then connect the second hanging bar (64) and the first hanging bar (51); S7, clamping the steel pipe column (6) by each clamping wall positioning mechanism (21); S8, checking the plane position and verticality of the steel pipe column (6) by external measuring equipment, and adjusting the plane position and verticality of the steel pipe column (6) by the clamping and adjusting action of each clamping wall positioning mechanism (21), so that the plane position and verticality of the steel pipe column (6) meet the design requirements; S9, recording the positioning position of each clamping wall positioning mechanism (21); S10, loosening each clamping wall positioning mechanism (21) to release the clamping effect on the steel pipe column (6), and then the third hanging rod (66) continues to hang the tool column (61) to lower the steel pipe column (6) to the designed elevation; S11, re-tightening each clamping wall positioning mechanism (21) so that each clamping wall positioning mechanism (21) clamps the tool column (61); S12, checking the plane position and verticality of the tool column (61) by means of external measuring equipment, and adjusting the plane position and verticality of the tool column (61) by means of the clamping and adjusting action of each clamping wall positioning mechanism (21), so that the plane position and verticality of the tool column (61) meet the design requirements; S13, the supporting mechanism (22) is brought into contact to support the top of the steel pipe column (6), and the third suspension rod (66) is loosened.

2. The underground engineering steel pipe column construction method according to claim 1 is characterized in that: The following steps are also included: S14, hanging the catheter (8) into the tool column (61); S15, pouring pile concrete (72) through the guide tube (8), and stopping pouring after the liquid level of the pile concrete (72) reaches the designed height below the bottom surface of the steel pipe column (6); S16, pouring cage concrete (71) through the conduit (8) until the liquid level of the cage concrete (71) reaches the top of the pile reinforcement cage (5) and then stopping; S17, backfilling the crushed stone (9) outside the steel pipe column (6) until the crushed stone (9) is backfilled to the designed height below the casing (3); S18, pouring concrete in the column through the conduit (8) until the liquid level of the concrete in the steel pipe column (6) reaches the top of the steel pipe column (6), then stop pouring and remove the conduit (8).

3. The underground engineering steel pipe column construction method according to claim 2 is characterized in that: The following steps are also included: S19, hanging the column top reinforcement cage (10) into the tool column (61), and fixing the column top reinforcement cage (10) to the top of the concrete in the column; S20, after the concrete in the column is finally set, remove the positioning device (2); S21, separating the tool column (61) from the steel pipe column (6), and lifting out the tool column (61).

4. The underground engineering steel pipe column construction method according to claim 3 is characterized in that: The following steps are also included: S22, backfill the pile hole with soil (11) to the ground, and then lift out the casing (3).

5. The underground engineering steel pipe column construction method according to claim 2, characterized in that: The bottom end of the tool column (61) is provided with an overflow hole (612).

6. The underground engineering steel pipe column construction method according to claim 2, characterized in that: In the above S17, the backfill height of the crushed stone (9) is at least 4m.

7. The underground engineering steel pipe column construction method according to any one of claims 1 to 6, characterized in that: The clamping wall positioning mechanism (21) comprises a plurality of clamping wall hydraulic cylinders (211), one end of each of the clamping wall hydraulic cylinders (211) being fixed on a positioning frame and arranged at intervals around the center of the travel channel (23), and the other end of each of the clamping wall hydraulic cylinders (211) being provided with an arc-shaped abutting block (212).

8. The underground engineering steel pipe column construction method according to any one of claims 1 to 6, characterized in that: The jacking mechanism (22) comprises two jacking blocks (221) and two jacking hydraulic cylinders (222); the two jacking blocks (221) are movably arranged on a positioning frame and are relatively arranged with the center of the travel channel (23) as a symmetrical center; the two jacking hydraulic cylinders (222) are arranged on the positioning frame and are respectively connected to the two jacking blocks (221).

9. The underground engineering steel pipe column construction method according to any one of claims 1 to 6, characterized in that: The positioning frame is provided with a working platform (25) above the supporting mechanism (22), and the side of the working platform (25) is provided with a guardrail (26). The four corners of the bottom of the positioning frame are provided with lifting and leveling support feet (24).

10. A positioning device (2) for an underground engineering steel pipe column, used to implement the underground engineering steel pipe column construction method according to any one of claims 1 to 9, characterized in that: The positioning device (2) comprises a positioning frame, a passage (23) for the steel pipe column (6) to pass through is formed in the middle of the positioning frame, at least two groups of axially spaced wall positioning mechanisms (21) are arranged in the passage (23), the wall positioning mechanisms (21) are used to clamp the outer wall of the steel pipe column (6) to position the steel pipe column (6), and the positioning frame is provided with an openable and closable supporting mechanism (22) above each wall positioning mechanism (21), and the supporting mechanism (22) is used to engage to support the top of the steel pipe column (6).

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