阅读说明：本技术 一种基坑逆作法钢管结构柱对接平台及对接方法 (Foundation pit reverse construction method steel pipe structure column butt joint platform and butt joint method ) 是由 陈兵 雷斌 李红波 李新元 胡亚江 闫肖飞 杨海霞 宋睿 于 2020-05-06 设计创作，主要内容包括：本发明公开了一种基坑逆作法钢管结构柱对接平台及对接方法,属于基坑逆作法结构柱施工技术领域,其包括上支撑架和下支撑架,下支撑架纵向设有两组螺杆,螺杆螺纹连接有套筒螺母,上支撑架一体连接有钢管套筒,螺杆部分插入钢管套筒内且钢管套筒下端抵压于套筒螺母上端；解决了现有的对接平台制作材料强度低、垂直度控制不足、稳定性不够等诸多问题。(The invention discloses a foundation pit reverse construction method steel pipe structural column butt-joint platform and a butt-joint method, belonging to the technical field of foundation pit reverse construction method structural column construction, wherein the foundation pit reverse construction method steel pipe structural column butt-joint platform comprises an upper support frame and a lower support frame, wherein the lower support frame is longitudinally provided with two groups of screw rods, the screw rods are in threaded connection with sleeve nuts, the upper support frame is integrally connected with a steel pipe sleeve, the screw rods are partially inserted into the steel pipe sleeve, and the lower end of the steel pipe sleeve is pressed; the problems that the existing butt joint platform manufacturing material is low in strength, insufficient in verticality control, insufficient in stability and the like are solved.)

1. The utility model provides a foundation ditch reverse construction method steel pipe structure post butt-joint platform, a serial communication port, including upper bracket and under bracing frame, the under bracing frame vertically is equipped with two sets of screw rods, screw rod threaded connection has box nut, upper bracket an organic whole is connected with the steel pipe sleeve, the screw rod part insert in the steel pipe sleeve just steel pipe sleeve lower extreme supports presses in the box nut upper end.

2. The foundation pit reverse construction method steel tube structure column docking platform of claim 1, wherein the screw comprises a threaded section and a non-threaded section, the non-threaded section is located at an upper end of the screw, and the non-threaded section is inserted into the steel tube sleeve.

3. The foundation pit reverse construction method steel tube structure column butt-joint platform of claim 1, wherein a plurality of rotating handles are horizontally connected to the side wall of the sleeve nut, the screw is a trapezoidal screw, and the thread pitch of the screw is 8 mm.

4. The foundation pit reverse construction method steel tube structure column butt-joint platform of claim 1, wherein the lower end of the screw is fixedly connected with a supporting steel plate, the supporting steel plate is integrally connected with the lower supporting frame, and the bottom of the lower supporting frame is fixed on the base steel plate.

5. The foundation pit reverse construction method steel pipe structural column butt-joint platform according to claim 4, wherein the upper support frame and the lower support frame are I-shaped steel support frames formed by cutting and welding 10mm thick steel plates, supporting steel bars are welded between the upper plane and the lower plane of the lower support frame, the base steel plate is made of steel plates with the size of 750mm × 1500mm and the thickness of 15mm, and lifting lugs are arranged on the base steel plate.

6. A foundation pit reverse construction method steel pipe structure column butt joint method is characterized by sequentially comprising a steel pipe column and tool column processing, manufacturing and transporting process, a butt joint platform installing process, a butt joint platform primary leveling process, a hoisting and positioning process, a butt joint platform secondary leveling process, a butt joint inspection process and a welding and fixing process;

the butt joint platform installation process comprises the following steps:

s31, the distance between adjacent butt-joint platforms is 5m, and the number of the butt-joint platforms required is determined according to the length of the steel pipe column;

s32, defining installation positions according to the number of the butt-joint platforms, and sequentially placing the butt-joint platforms on the defined installation positions;

s33, two expansion screws fixed on the ground are arranged at each of the four corners of the butt joint platform, and the four expansion screws are welded at the end parts of the two expansion screws by using deformed steel bars so as to form four fixing fasteners for respectively fixing the four corners of the butt joint platform;

the first leveling process of the butt joint platform comprises the following steps:

s41, preparing a level, checking the i-angle error of the level, and determining that the i-angle error of the level is not more than 15';

s42, erecting the level gauge in the middle of the area where all the butt-joint platforms are located, placing the leveling rods on the upper support frames of all the butt-joint platforms one by one, and rotating sleeve nuts of the butt-joint platforms to enable all the butt-joint platforms to be adjusted to the designed height;

the secondary leveling process of the butt joint platform comprises the following steps:

s61, starting a level gauge after the steel pipe column and the tool column are hoisted to the butt joint platform;

and S62, checking all the docking platforms again by using the level, rotating sleeve nuts of the docking platforms, and adjusting all the docking platforms to the designed height.

7. The foundation pit reverse construction method steel pipe structure column butt joint method according to claim 6, wherein the machining, manufacturing and transporting process of the steel pipe column and the tool column comprises the following steps:

s11, manufacturing the steel pipe column and the tool column according to the requirements on the structure and the verticality in the preset standard;

and S12, if the length of the finished steel pipe column exceeds the transportation requirement, manufacturing in sections and transporting in sections to a docking site.

8. The foundation pit reverse construction method steel pipe structure column butt joint method according to claim 6, wherein a butt joint site hardening treatment process is further included between the steel pipe column and tool column processing and transporting process and the butt joint platform installing process, and the butt joint site hardening treatment process includes the steps of:

s21, cleaning sundries and floating slurry on the surface of the butt joint site;

s22, pouring a C15 concrete terrace with the thickness of 15cm, wherein the error of the flatness of the base surface of the terrace is controlled within 3mm within 10m, and the error of the terrace is controlled within 5mm beyond 10 m;

and S23, after the floor surface is dried, marking the installation position of the butt joint platform by using paint.

9. The foundation pit reverse construction method steel tube structure column butt joint method according to claim 6, wherein the hoisting and positioning process comprises the following steps:

s51, installing two wood tenons on the upper support frame of each butt joint platform;

s52, hoisting the steel pipe column to be butted and the tool column between two tenons of the butting platform by a crane respectively;

and S53, arranging the butt bolts in the alignment holes of the steel pipe column and the tool column, and screwing the butt bolts to 60%.

10. The foundation pit reverse construction method steel tube structure column butt joint method according to claim 6, wherein the butt joint inspection process comprises performing a vertical butt joint precision inspection and a horizontal butt joint precision inspection on the steel tube column;

the vertical direction butt joint precision inspection comprises the following specific steps:

s71, setting n measuring points along the length direction of the steel pipe column;

s72, measuring the height value of the steel pipe column at each measuring point, and sequentially recording the height value as H₁，H₂，…，H_n；

S73, calculating the error m by adopting the Bessel formula₁If m is₁If m is less than or equal to 1/600, entering the horizontal butt joint precision check, if m is less than or equal to₁>1/600, loosening the butt bolt and readjusting until m₁≤1/600；

The horizontal direction butt joint precision inspection comprises the following specific steps:

s74, arranging the two laser levels on two sides of one end, far away from the tool column, of the steel pipe column, and adjusting the positions of the two laser levels to enable the laser lines to be parallel to the axis of the steel pipe column and enable the height of the laser lines to be consistent with the height of the axis of the steel pipe column;

s75, selecting n measuring points at two ends of the steel pipe column and near the butt joint position of the steel pipe column and the steel pipe column along the length direction of the steel pipe column;

s76, measuring the distances from the pipe walls on the two sides of the steel pipe column to the laser lines of the two laser levels at the measuring points by adopting a ruler with horizontal bubbles, and respectively recording the distances as L₁，L₂，…，L_nAnd R₁,R₂,…，R_n；

S77, data L₁，L₂，…，L_nObtaining the left bending error m by adopting the Bessel formula₂According to the data R₁,R₂,…，R_nThe right direction bending error m is obtained by adopting the Bessel formula₃；

S78, if m₂And m₃When m is less than or equal to 1/600, the welding procedure is performed, if m is less than or equal to 1/600₂And m₃If one of the bolts is larger than 1/600, the butt bolt needs to be loosened and readjusted until m is larger than₂And m₃Are less than or equal to 1/600.

Technical Field

The invention relates to the technical field of foundation pit reverse construction method structural column construction, in particular to a foundation pit reverse construction method steel pipe structural column butt joint platform and a butt joint method.

Background

With the development of economy in China, large-scale high-rise building foundation foundations for urban construction, basements, large-scale underground shopping malls, underground parking lots, subway stations and the like face the problem of deep foundation pit engineering, the deep foundation pit underground structure is constructed layer by layer from top to bottom by a reverse construction method, and compared with the traditional deep foundation pit construction method, the unconventional construction method has obvious advantages in the aspects of environmental protection, resource saving, construction period control and the like.

When the reverse construction method is used for construction, the underground structure foundation pile is firstly constructed, and the steel pipe structure column is one of the common forms. When the steel pipe structure column is constructed, the precision generally reaches 1/300-1/500, and some even 1/1000. In order to meet the high precision requirement, a full-casing full-slewing drilling machine is generally adopted for positioning. Because the height of the full-casing full-slewing drilling machine is about 3.5m, the elevation of the top of the steel pipe pile is generally positioned below the ground, and in order to meet the requirement of drill hole positioning of the drilling machine, a structural column is generally adopted for positioning in a mode of connecting a tool column during construction.

In order to meet the high precision requirement in the positioning of the structural column, the steel pipe structural column and the tool column are both reserved and manufactured in a factory. In actual construction, when the length of the steel pipe structure column is overlong in the foundation pit reverse construction method, a steel structure factory generally adopts segmented manufacture for facilitating transportation, and then the steel structure factory is transported to a construction site for butt joint, wherein the butt joint comprises the butt joint of the steel pipe columns and tool columns.

The traditional splicing platform is composed of a plurality of splicing frames which are arranged at certain intervals, the splicing frames are generally processed and manufactured by channel steel and angle iron and are arranged at intervals of about 5m, and 2 steel pipe columns can be accommodated on the platform frame at one time for operation; during butt joint, the height mark of each frame is utilized, the side baffle is arranged on the same vertical surface and is vertical to the horizontal plane of the platform, and the central axes of the two sections of steel pipes are kept on the same line.

However, the above technical solutions have the following problems:

1. preparing materials: the traditional butt-joint platform is formed by welding common channel steel and triangular iron, and has low material strength, easy bending and easy rusting;

2. and (3) controlling the verticality: because the frame is manufactured by welding, a height adjusting device is not arranged, and the frame needs to be adjusted by increasing or decreasing gaskets after the frame is lifted by a crane, the verticality control in the splicing process of the steel pipe column completely depends on the ground flatness and the experience of constructors;

3. stability: traditional shelf is owing to not set up fixing device on ground, when the steel-pipe column was put in hoist lifting, produces easily because the local atress that the focus offset leads to is too big and easily causes the shelf to warp and topple over, has certain safe risk.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a safe, reliable and accurate site butt joint platform for the steel pipe column by the foundation pit reverse construction method, and a set of site butt joint and verticality control construction method is summarized.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the utility model provides a foundation ditch reverse construction method steel tubular construction post butt-joint platform, includes upper bracket and under bracing frame, the under bracing frame vertically is equipped with two sets of screw rods, screw rod threaded connection has box nut, upper bracket body coupling has the steel pipe sleeve, the screw rod part insert in the steel pipe sleeve just steel pipe sleeve lower extreme supports presses in the box nut upper end.

By adopting the technical scheme, the sleeve nut is rotated by a worker, and can move up and down on the screw rod due to the fact that the sleeve nut is in threaded connection with the screw rod, so that the upper support frame is lifted up or lowered down; in the actual butt joint work, a user needs to prepare a plurality of butt joint platforms, then the butt joint platforms are distributed along the straight line direction, the upper support frames of all the butt joint platforms are adjusted to the same preset height, then tools such as a crane and the like can be adopted to lift the steel pipe column and the tool column onto the butt joint platforms, the steel pipe column and the tool column can be in butt joint under the condition of one horizontal place, and therefore the condition that objective non-horizontal factors influence the verticality control when the steel pipe column and the tool column are in butt joint is avoided; the butt joint work according to the present invention refers to a butt joint work between a steel pipe column and a steel pipe column or between a steel pipe column and a tool column.

Preferably, the screw comprises a threaded section and a non-threaded section, the non-threaded section is positioned at the upper end of the screw, and the non-threaded section is inserted into the steel pipe sleeve.

Through adopting above-mentioned technical scheme, the cap nut is rotatory to the top of screw thread section at most, and can't rotate to no screw thread section for the screw rod always can have one section no screw thread section and be pegged graft with the steel pipe sleeve and cooperate, avoids the staff excessively to rotate cap nut and causes the condition that screw rod and steel pipe sleeve break away from completely to take place.

Preferably, the side wall of the sleeve nut is horizontally connected with a plurality of rotating handles, the screw is a trapezoidal screw, and the thread pitch of the screw is 8 mm.

By adopting the technical scheme, the rotating handle is used for helping a worker to rotate the sleeve nut; the trapezoidal screw can improve the bearing capacity of the screw.

Preferably, the lower end of the screw is fixedly connected with a supporting steel plate, the supporting steel plate is integrally connected with the lower supporting frame, and the bottom of the lower supporting frame is fixed on the base steel plate.

Through adopting above-mentioned technical scheme, the steel sheet of supporting increases the area of contact of screw rod and bottom suspension mast, and the basement steel sheet increases the area of contact of bottom suspension mast and ground, all is used for the homodisperse atress.

Preferably, the upper support frame and the lower support frame are both I-shaped steel support frames formed by cutting and welding 10mm thick steel plates, supporting steel bars are welded between the upper plane and the lower plane of the lower support frame, the base steel plate is made of steel plates with the size of 750mm × 1500mm and the thickness of 15mm, and lifting lugs are arranged on the base steel plate.

Through adopting above-mentioned technical scheme, the structural strength of bottom suspension strut can be improved to the support reinforcement, and the jack-up lug is for the convenience crane hoist butt joint platform.

A foundation pit reverse construction method steel tube structure column butt joint method sequentially comprises a steel tube column and tool column machining, manufacturing and transporting process, a butt joint platform installing process, a butt joint platform primary leveling process, a hoisting in-place process, a butt joint platform secondary leveling process, a butt joint inspection process and a welding and fixing process;

the butt joint platform installation process comprises the following steps:

s31, the distance between adjacent butt-joint platforms is 5m, and the number of the butt-joint platforms required is determined according to the length of the steel pipe column;

s32, defining installation positions according to the number of the butt-joint platforms, and sequentially placing the butt-joint platforms on the defined installation positions;

s33, two expansion screws fixed on the ground are arranged at each of the four corners of the butt joint platform, and the four expansion screws are welded at the end parts of the two expansion screws by using deformed steel bars so as to form four fixing fasteners for respectively fixing the four corners of the butt joint platform;

the first leveling process of the butt joint platform comprises the following steps:

s41, preparing a level, checking the i-angle error of the level, and determining that the i-angle error of the level is not more than 15';

s42, erecting the level gauge in the middle of the area where all the butt-joint platforms are located, placing the leveling rods on the upper support frames of all the butt-joint platforms one by one, and rotating sleeve nuts of the butt-joint platforms to enable all the butt-joint platforms to be adjusted to the designed height;

the secondary leveling process of the butt joint platform comprises the following steps:

s61, starting a level gauge after the steel pipe column and the tool column are hoisted to the butt joint platform;

and S62, checking all the docking platforms again by using the level, rotating sleeve nuts of the docking platforms, and adjusting all the docking platforms to the designed height.

Preferably, the working procedure of processing, manufacturing and transporting the steel pipe column and the tool column comprises the following steps:

s11, manufacturing the steel pipe column and the tool column according to the requirements on the structure and the verticality in the preset standard;

and S12, if the length of the finished steel pipe column exceeds the transportation requirement, manufacturing in sections and transporting in sections to a docking site.

Preferably, the method further comprises a butt-joint site hardening treatment step between the steps of processing, manufacturing and transporting the steel pipe column and the tool column and the step of installing the butt-joint platform, wherein the butt-joint site hardening treatment step comprises the following steps:

s21, cleaning sundries and floating slurry on the surface of the butt joint site;

s22, pouring a C15 concrete terrace with the thickness of 15cm, wherein the error of the flatness of the base surface of the terrace is controlled within 3mm within 10m, and the error of the terrace is controlled within 5mm beyond 10 m;

and S23, after the floor surface is dried, marking the installation position of the butt joint platform by using paint.

Preferably, the hoisting and positioning process comprises the following steps:

s51, installing two wood tenons on the upper support frame of each butt joint platform;

s52, hoisting the steel pipe column to be butted and the tool column between two tenons of the butting platform by a crane respectively;

and S53, arranging the butt bolts in the alignment holes of the steel pipe column and the tool column, and screwing the butt bolts to 60%.

Preferably, the butt joint inspection step includes performing a vertical butt joint accuracy inspection and a horizontal butt joint accuracy inspection on the steel pipe column;

the vertical direction butt joint precision inspection comprises the following specific steps:

s71, setting n measuring points along the length direction of the steel pipe column;

s72, measuring the height value of the steel pipe column at each measuring point, and sequentially recording the height value as H₁，

H₂，…，H_n；

S73, calculating the error m by adopting the Bessel formula₁If m is₁If m is less than or equal to 1/600, entering the horizontal butt joint precision check, if m is less than or equal to₁>1/600, loosening the butt bolt and readjusting until m₁≤1/600；

The horizontal direction butt joint precision inspection comprises the following specific steps:

s74, arranging the two laser levels on two sides of one end, far away from the tool column, of the steel pipe column, and adjusting the positions of the two laser levels to enable the laser lines to be parallel to the axis of the steel pipe column and enable the height of the laser lines to be consistent with the height of the axis of the steel pipe column;

s75, selecting n measuring points at two ends of the steel pipe column and near the butt joint position of the steel pipe column and the steel pipe column along the length direction of the steel pipe column;

s76, measuring the distances from the pipe walls on the two sides of the steel pipe column to the laser lines of the two laser levels at the measuring points by adopting a ruler with horizontal bubbles, and respectively recording the distances as L₁，L₂，…，L_nAnd R₁,R₂,…，R_n；

S77, data L₁，L₂，…，L_nObtaining the left bending error m by adopting the Bessel formula₂According to the data R₁,R₂,…，R_nThe right direction bending error m is obtained by adopting the Bessel formula₃；

S78, if m₂And m₃When m is less than or equal to 1/600, the welding procedure is performed, if m is less than or equal to 1/600₂And m₃If one of the bolts is larger than 1/600, the butt bolt needs to be loosened and readjusted until m is larger than₂And m₃Are less than or equal to 1/600.

The invention has the beneficial effects that:

1. simple manufacture and convenient operation

The butt joint platform is simple in structural design, convenient to manufacture and convenient to lift, disassemble, assemble and operate;

2. high positioning efficiency

The butt joint adjustment can be quickly completed only by manually adjusting the lifting screw device, and the butt joint device is simple and easy to operate, convenient to operate and high in positioning efficiency;

3. high butt joint precision

The sleeve nut is manually rotated, the height of the upper support frame is accurately controlled, the verticality can be checked and checked by adopting a precise level and a laser level in the butt joint process, and the requirement of the verticality met by butt joint can be met by adjusting deviation;

4. safe and reliable

The base of the butt joint platform is placed in a hard-ground field, so that structural column deviation and accidental safety accidents caused by uneven settlement can be effectively prevented;

the base is provided with a base steel plate with the thickness of 10mm and is fixed by expansion screws and deformed steel bars, so that the platform is prevented from sliding under stress, and the safety and stability of the platform are improved; the manual screw rod lifting frame adopts a trapezoidal thread screw rod with a self-locking function, and meanwhile, a thread-free part with the length of 95mm is arranged at the upper end of the trapezoidal thread screw rod, so that the unstable danger of a platform caused by excessive rising of the regulator can be effectively controlled;

5. low comprehensive cost

The docking platform is self-made, materials are economical, and the requirements can be met only by 2-3 people during operation; the platform is convenient to disassemble and assemble, can be repeatedly used and is low in comprehensive cost.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of a docking platform according to the present invention;

FIG. 2 is a schematic view of the construction of the screw and the collet nut of the present invention;

FIG. 3 is a front view of the present invention during vertical docking accuracy inspection;

fig. 4 is a plan view of the present invention when performing a horizontal docking accuracy inspection.

The reference numerals in the figures are explained below:

1. a docking platform; 101. an upper support frame; 102. a lower support frame; 103. a screw; 104. a sleeve nut; 105. a steel pipe sleeve; 106. rotating the handle; 107. a support steel plate; 108. a base steel plate; 109. supporting the reinforcing steel bars; 110. hoisting lifting lugs; 2. steel pipe columns; 3. a tool post; 4. laser level meter.

Detailed Description

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.

The butt joint work of steel structure post and instrument post is accomplished to traditional mode, and what adopt is ordinary butt joint platform, need utilize tools such as gasket and staff's construction experience, accomplishes the regulation of all butt joint platform's levelness to, easily produce because the local atress that the focus offset leads to is too big and easily causes the shelf to warp and empty.

In order to solve the technical problems, the invention respectively provides a foundation pit reverse construction method steel pipe structure column butt joint platform and a foundation pit reverse construction method steel pipe structure column butt joint method.

The utility model provides a foundation ditch reverse construction method steel pipe structure post butt joint platform, as shown in fig. 1 and fig. 2, includes upper support frame 101 and lower support frame 102, and lower support frame 102 vertically is equipped with two sets of screws 103, and screw 103 threaded connection has sleeve nut 104, and upper support frame 101 an organic whole is connected with steel pipe sleeve 105, and screw 103 part inserts in steel pipe sleeve 105 and steel pipe sleeve 105 lower extreme supports and presses in sleeve nut 104 upper end.

The specific working principle is as follows: the worker rotates the sleeve nut 104, and as the sleeve nut 104 is in threaded connection with the screw 103, the sleeve nut 104 can move up and down on the screw 103, so that the upper support frame 101 is raised or lowered; in the actual butt joint work, a user needs to prepare a plurality of butt joint platforms 1, then the butt joint platforms 1 are distributed along the straight line direction, the upper support frames 101 of all the butt joint platforms 1 are adjusted to the same preset height, then tools such as a crane and the like can be adopted to lift the steel pipe column 2 and the tool column 3 onto the butt joint platforms 1, the steel pipe column 2 and the tool column 3 can be in butt joint under the condition of one horizontal ground, and therefore the condition that objective non-horizontal factors influence the verticality control when the steel pipe column 2 and the tool column 3 are in butt joint is avoided; the butt joint work according to the present invention refers to a butt joint work between the steel pipe column 2 and the steel pipe column 2 or between the steel pipe column 2 and the tool column 3.

The screw 103 comprises a threaded section and a non-threaded section, the non-threaded section is positioned at the upper end of the screw 103, and the non-threaded section is inserted into the steel pipe sleeve 105; the sleeve nut 104 rotates to the top of the threaded section at most and cannot rotate to the unthreaded section, so that one unthreaded section of the screw 103 is always in plug-in fit with the steel pipe sleeve 105, and the situation that the screw 103 is completely separated from the steel pipe sleeve 105 due to the fact that a worker excessively rotates the sleeve nut 104 is avoided.

The side wall of the sleeve nut 104 is horizontally connected with a plurality of rotating handles 106, the screw 103 is a trapezoidal screw 103, and the thread pitch of the trapezoidal screw 103 is 8 mm; a rotation handle 106 is used to assist a worker in rotating collet nut 104; the trapezoidal screw 103 can improve the bearing capacity of the screw 103.

The lower end of the screw 103 is fixedly connected with a supporting steel plate 107, the supporting steel plate 107 is integrally connected with the lower support frame 102, and the bottom of the lower support frame 102 is fixed on a base steel plate 108; the supporting steel plate 107 increases the contact area between the screw 103 and the lower support frame 102, and the base steel plate 108 increases the contact area between the lower support frame 102 and the ground, which are used for uniformly dispersing the stress.

The upper support frame 101 and the lower support frame 102 are both I-steel support frames formed by cutting and welding 10mm thick steel plates, supporting steel bars 109 are welded between the upper plane and the lower plane of the lower support frame 102, the base steel plate 108 is made of steel plates with the size of 750mm × 1500mm and the thickness of 15mm, lifting lugs 110 are arranged on the base steel plate 108, the structural strength of the lower support frame 102 can be improved through the supporting steel bars 109, and the lifting lugs 110 are convenient for a crane to lift the butt-joint platform 1.

The docking platform 1 provided by the invention can be manufactured on the docking site, and all the used parts can be purchased, so that the specification of each part is specifically provided by the invention.

1. Base seat

(1) The base comprises a base steel plate 108, an I-steel type lower support frame 102 and a lifting lug 110, wherein the base steel plate 108 is welded with the lower support frame 102 and mainly used for supporting a stress structure and supporting and stabilizing the bottom of the docking platform 1.

(2) The base steel plate 108 is a 15mm steel plate with the size of 750mm × 1500mm being 1500mm, and provides a supporting and stress basis for the platform.

(3) The lower support frame 102 is made of nonstandard I-shaped steel and formed by cutting and welding 10mm thick steel plates, the plane size is 165mm × 90mm (the length is × mm), and in order to improve the bearing capacity of the lower portion of the adjusting bolt structure, a support steel bar 109 (a twisted steel bar phi 25mm, the length is 145mm) is welded below the center of the support steel plate 107.

(4) Lifting lug 110: provides binding for hoisting and carrying and is formed by cutting and welding 10mm steel plates.

2. Lifting structure

(1) The lifting structure comprises a screw 103 with a supporting bottom plate, a sleeve nut 104 with a rotating handle 106 and an upper support frame 101 with an I-steel type with a steel pipe sleeve 105.

(2) The screw 103 with the supporting bottom plate is characterized in that the screw 103 is made of Tr55 × 8 alloy tool steel, the length of the screw 103 is 225mm, the nominal diameter of the screw is 55mm, the thread pitch of the screw is 8mm, the upper end of the screw 103 is provided with a thread-free section, the length of the thread-free section is 95mm, so that the screw 103 is matched with the upper supporting frame 101 stably and safely, the supporting steel plate 107 is formed by cutting a steel plate with the thickness of 20mm, the size of the supporting steel plate is 155mm × 150mm, support is provided for the screw 103, the screw 103 is welded at the center of the supporting steel plate 107.

(3) Collet nut 104 with rotating handle 106: the rotating handle 106 is three phi 12mm thread steel bars which are welded on the side wall of the sleeve nut 104 at equal intervals; the sleeve nut 104 is made of alloy tool steel, adopts trapezoidal threads with the nominal diameter of 55mm, has the thread pitch of 8mm, meets the self-locking condition, and has the outer diameter of 80mmm and the sleeve height of 60 mm.

(4) The I-shaped steel type upper support frame 101 with the steel pipe sleeve 105 is formed by cutting and welding 10mm steel plates, and the size of the I-shaped steel type upper support frame is that the waist height is 165mm, the × leg width is 150mm, the waist thickness is × mm.

In order to improve the butting precision of the butting work, the invention also provides a butting method of the steel pipe structural column by the foundation pit reverse construction method.

A steel pipe structure column butt joint method of a foundation pit reverse construction method sequentially comprises a steel pipe column and tool column machining, manufacturing and transporting process S1, a butt joint site hardening treatment process S2, a butt joint platform installation process S3, a butt joint platform primary leveling process S4, a hoisting and positioning process S5, a butt joint platform secondary leveling process S6, a butt joint inspection process S7 and a welding and fixing process S8.

First, the processing, manufacturing and transporting process S1 of the steel pipe column and the tool column

The process comprises the following steps:

s11, manufacturing the steel pipe column 2 and the tool column 3 according to the requirements on structure and perpendicularity in the preset standard;

and S12, if the length of the finished steel pipe column 2 exceeds the transportation requirement, manufacturing in sections, and transporting in sections to a butt joint site.

And after the steel pipe column 2 is transported to a butt joint site, the steel pipe column is stacked to a designated area according to a construction partition diagram, the steel pipe column is stacked in a classified manner, a rack is erected to be horizontally placed in a single layer, and a tenon is used for fixing to prevent rolling.

Second, butt-joint site hardening treatment step S2

The process comprises the following steps:

s21, cleaning sundries and floating slurry on the surface of the butt joint site;

s22, pouring a C15 concrete terrace with the thickness of 15cm, wherein the error of the flatness of the base surface of the terrace is controlled within 3mm within 10m, and the error of the terrace is controlled within 5mm beyond 10 m;

and S23, after the floor surface is dried, marking the installation position of the butt joint platform 1 by paint.

Thirdly, mounting procedure S3 of butt joint platform

The process comprises the following steps:

s31, the distance between adjacent butt-joint platforms 1 is 5m, and the number of the butt-joint platforms 1 required is determined according to the length of the steel pipe column 2;

s32, defining installation positions according to the number of the docking platforms 1, and sequentially placing the docking platforms 1 on the defined installation positions;

s33, four angles of butt joint platform 1 all are provided with two expansion bolts of fixing on ground, and utilize the screw-thread steel welding at two expansion bolt tip to form four fixed fasteners and fix four angles of base steel sheet 108 respectively.

The expansion screws and the threaded steel in the step S33 can be seen at the four corners of the base steel plate 108 in fig. 1.

Fourth, the first leveling process of the docking platform S4

The process comprises the following steps:

s41, preparing a level, checking the i-angle error of the level, and determining that the i-angle error of the level is not more than 15';

and S42, erecting the level gauge in the middle of the area where all the docking platforms 1 are located, placing the leveling rods on the upper support frames 101 of all the docking platforms 1 one by one, and rotating the sleeve nuts 104 of the docking platforms 1 to adjust all the docking platforms 1 to the designed height.

Fifth, hoisting in-place procedure S5

The process comprises the following steps:

s51, installing two wood tenons on the upper support frame 101 of each butt joint platform 1;

s52, hoisting the steel pipe column 2 and the tool column 3 to be butted between two tenons of the butting platform 1 by a crane respectively;

and S53, arranging the butt bolts in the alignment holes of the steel pipe column 2 and the tool column 3, and screwing the butt bolts to 60%.

Sixthly, secondary leveling procedure S6 of butt joint platform

The process comprises the following steps:

s61, starting a level gauge after the steel pipe column 2 and the tool column 3 are hoisted to the butt joint platform 1;

and S62, checking all the docking platforms 1 again by using the level gauge, rotating the sleeve nuts 104 of the docking platforms 1, and adjusting all the docking platforms 1 to the designed height.

Seventhly, a butt joint inspection process S7

This process includes a vertical butt joint precision inspection and a horizontal butt joint precision inspection of the steel pipe column 2.

As shown in fig. 3, the vertical docking accuracy inspection includes the following steps:

s71, setting n measuring points along the length direction of the steel pipe column 2;

s72, measuring the height value of the steel pipe column 2 at each measuring point, and recording the height values as H in sequence₁，H₂，…，H_n；

S73, calculating the error m by adopting the Bessel formula₁If m is₁If m is less than or equal to 1/600, entering the horizontal butt joint precision check, if m is less than or equal to₁>1/600, loosening the butt bolt and readjusting until m₁≤1/600；

As shown in fig. 4, the horizontal docking accuracy inspection includes the following specific steps:

s74, arranging the two laser levels 4 on two sides of one end, far away from the tool column 3, of the steel pipe column 2, and adjusting the positions of the two laser levels 4 to enable laser lines emitted by the two laser levels to be parallel to the axis of the steel pipe column 2, wherein the height of the laser lines is consistent with the height of the axis of the steel pipe column 2;

s75, selecting n measuring points at two ends of the steel pipe column 2 and near the butt joint position of the steel pipe column 2 and the steel pipe column 2 along the length direction of the steel pipe column 2;

s76, measuring the distances from the pipe walls on the two sides of the steel pipe column 2 to the laser lines of the two laser levels 4 at the measuring point by adopting a ruler with horizontal bubbles, and respectively recording the distances as L₁，L₂，…，L_nAnd R₁,R₂,…，R_n；

S77, data L₁，L₂，…，L_nObtaining the left bending error m by adopting the Bessel formula₂According to the data R₁,R₂,…，R_nThe right direction bending error m is obtained by adopting the Bessel formula₃；

S78, if m₂And m₃When m is less than or equal to 1/600, the welding procedure is performed, if m is less than or equal to 1/600₂And m₃If one of the bolts is larger than 1/600, the butt bolt needs to be loosened and readjusted until m is larger than₂And m₃Are less than or equal to 1/600.

Eighthly, welding and fixing process S8

The procedure is carried out after the butt joint inspection procedure, a conventional welding and fixing mode is adopted, and load bearing on the butt joint platform is forbidden during welding.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.