CN114164934A

CN114164934A - Construction method of large-span columnar bolt ball joint net rack

Info

Publication number: CN114164934A
Application number: CN202111431044.6A
Authority: CN
Inventors: 陈淑丽; 王瑾; 史晨霞; 刘龙忠; 张振军; 李辉; 原云洁; 段永刚; 孙瑞娜; 赵成学
Original assignee: Shanxi First Construction Group Co Ltd
Current assignee: Shanxi First Construction Group Co Ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-03-11

Abstract

The invention belongs to the technical field of building construction, and discloses a construction method of a large-span columnar bolt ball joint net rack, which comprises the following steps: construction preparation; basic measurement and rechecking; counting and sorting the approach components; mounting a bracket: starting to install the gable net rack, installing the arched net racks on two sides in a follow-up manner, arranging temporary supports, folding and correcting the arched net racks on the two sides, hoisting and correcting the small units, and welding the support; carrying out anticorrosion and fireproof coating on the installed net rack; and (6) checking and accepting. The invention adopts a construction method combining a block installation method and an overhead bulk method, and utilizes a construction method of a gable starting and deflection control method to finish the installation of a starting net rack, tension ropes and temporary support rods are added in sections in the assembling process of the starting rack to ensure the design arch degree and the external dimension of the net rack, the installation method of the net racks on the rest parts adopts a method of carrying out overhead bulk assembly towards one end by taking the starting rack as a reference, and the gable of the net rack adopts a construction method of carrying out overhead bulk assembly from one end to the other end.

Description

Construction method of large-span columnar bolt ball joint net rack

Technical Field

The invention belongs to the technical field of building construction, and particularly relates to a construction method of a large-span columnar bolt ball joint net rack.

Background

At present, the technology of taking the grid structure as the design of the traditional large-span coal shed is mature. More than 90% of the existing coal storage yards in China adopt the form of steel mesh frames and color steel plates. When carrying out the rack installation, especially to large-scale arc rack, there is the rack span big, high, and the job site windrow is many, and the place is narrow and small scheduling problem. Therefore, proper construction methods are required to be selected for installation so as to ensure the requirement of safety and stability. The net rack is installed to ensure stability coefficient and space rigidity, can effectively bear asymmetric load, concentrated load and dynamic load, and has better anti-seismic performance.

Disclosure of Invention

In view of the above, the present invention provides a method for constructing a large-span stud ball joint grid, which solves the problems identified in the background art.

In order to achieve the purpose of the invention, the technical scheme is as follows:

a construction method of a large-span column bolt ball joint net rack comprises the following steps:

firstly, construction preparation;

secondly, basic measurement and rechecking;

thirdly, counting and sorting the approach components;

fourthly, mounting a bracket: starting to install the gable net rack, installing the arched net racks on two sides in a follow-up manner, arranging temporary supports, folding and correcting the arched net racks on the two sides, hoisting and correcting the small units, and welding the support;

fifthly, performing anti-corrosion coating and fireproof coating on the installed net rack;

sixthly, performing item acceptance inspection on the installed net rack.

As a further improvement of the present invention, in the fourth step, the specific process of installing the bracket is as follows:

(1) installing a gable part, comprising a layer of grids and components on the lower part of the gable, connecting all the supports on one layer together by using rod pieces and nodes, wherein the central line of each support is overlapped with the central line of an embedded part during installation, performing vertical deflection and shift correction on one layer of grids by using a theodolite or a hanging hammer after the installation is finished, and fixing the supports and the embedded parts by spot welding after the support and the embedded parts are qualified;

(2) the arc net racks on the two sides of the shaft gable are installed and connected with the gable net rack;

(3) after the installation of the gable and the net rack layer on the cambered surfaces on the two sides is finished, a subsequent component of the gable and the net grid with the upper chord and the lower chord of the cambered surface on the two sides is installed under the coordination of a crane, the upper chord and the lower chord are both two grids, the installation height comprises that a support reaches 14.5m, the gable installation area is 14.5, 95 is approximately equal to 1378 square meters, and from the aspect of construction safety, the safe construction requirement cannot be met only by using the arc net racks on the two sides as supports of the gable net rack, cable wind ropes or diagonal braces must be arranged on the two sides of the gable, the distance between the cable wind ropes is about 15.0m, and temporary supports should be arranged on the cambered surfaces on the two sides;

(4) after the gable is installed to 3 grids, about 12.0m, in order to ensure the construction safety of the gable, the cable rope and an anchor post of the cable rope are arranged. The cable wind rope should adopt wire rope, and the anchor bar should be on fixed building, when not having fixed place to fix, should beat ground anchor pile on the ground, ground anchor pile adopts the reinforcing bar crotch to squeeze into underground, must slope 45, and the degree of depth is no less than 1.0 meter. The tension of the guy rope adopts a turnbuckle bolt, five groups of guy ropes are arranged because the lattice column is higher, and each group has two guy ropes.

The pull rod is used as a temporary support, the pull rod is made of a steel pipe with phi 377 x 10, the length of the steel pipe is 18-20 m, and the ear plate and the bottom plate are made of 20mmm rear steel plates according to the field situation.

(5) After the cable wind rope or the diagonal brace is installed, other three shaft gable walls and net racks on two sides can be installed, a 50t crane is needed for installation in the process, the three grids are installed on the upper chord and the lower chord of the installation, the grid is 12m, and the total height is 26 m;

(6) the overhanging of the upper parts of the inner sides of the cambered surface net racks at two sides is relatively large, about 9.0m, the node space position reaches 26m, temporary supports are required to be arranged from the safety perspective, and the lower bowstring balls at the inner sides of the cambered surface net racks are respectively hung by a 100t crane at two sides of the cambered surface to be used as the temporary supports, so that the overhanging parts are prevented from being unexpected in subsequent installation, and the subsequent net racks are convenient to install.

The installation of the arch parts on two sides should not exceed 4 grids each time, namely 4 grids on each of the upper and lower chords, the area is 16.29 × 24 ≈ 390.912 square meters, and the theoretical weight is about 10.85 t. The temporary support is hung on the lower chord ball of the net rack. And hoisting by adopting a 100t crane at a point to serve as a temporary support.

(7) After the two 100t cranes enter a working state, the cambered net rack and the gable are mutually supported, subsequent installation is carried out under the coordination of the other two cranes, the installation is 4 grids, and as the space height is increased, the second group of mechanical supports adopt the two 120t cranes and also hang the lower chord ball on the inner side of the cambered net rack to finish the installation of the subsequent 4 grids;

the second set of machine supports uses two 120t cranes due to the increase in space height. And similarly, hoisting the lower chord ball at the inner side of the cambered surface net rack to finish the installation of the subsequent 4 grids.

All the crane hoisting points adopt one hoisting point (the net rack lower chord node is obtained), and the steel wire rope is in a vertical state. The wire rope for the hoisting point adopts a rope sleeve, so that the operating radius of the crane is reduced as much as possible under the condition that the hoisting arm is not in the space and is not in the position of the net rack for resisting the rod, and the working performance of the crane is improved. The crane specifications mentioned above have been selected with some disadvantages in mind.

As mentioned above, the third group of temporary supports also uses a 120t crane as a temporary support due to the increase of the space height, and the final rack installation is completed.

(8) The clerestory can be installed along with the basic net rack or independently;

(9) after the foundation net rack is installed and the cambered surface is closed, the foundation net rack forms a closed stable structural frame, and temporary supports such as a cable rope, a pull rod and the like can be detached;

(10) and the subsequent net rack is installed by adopting an overhead bulk method, the net rack to be installed is spliced into small units on the ground, the small units are hung to the corresponding positions of the net rack installed in the air by using a crane, and the small units are connected with the net rack by overhead workers.

High-altitude bulk installation method

The high-altitude bulk method is a method for directly hoisting standard small assembly units or parts (single rod piece and single node) at a designed position for installation. The high-altitude bulk process requires that the field is flat, and all cones to be lifted are spliced and arranged regularly for assembly at any time.

The high-altitude splice develops from the ridge part of the middle roof to the two sides so as to reduce the accumulated deviation and facilitate the elevation control. The overall installation sequence is that high-altitude bulk loading is carried out from a standard net rack unit which is hoisted in place to two directions respectively, the high-altitude bulk loading is propelled in a triangular sequence, the high-altitude bulk loading is installed into two triangles and gradually expands to be intersected, the high-altitude bulk loading is advanced in a herringbone shape, and finally the high-altitude bulk loading is closed in the center of one end, wherein a large arrow in the figure represents the installation direction, and a small arrow represents the installation sequence.

When the high-altitude bulk is carried out, each working face can divide installation personnel into two parts, one part is assembled with a small ground unit, the other part is installed at high altitude, and the installation procedure is as follows: firstly, ground assembling personnel assemble the net rack to be installed into small units on the ground according to the requirements of drawings, the small units are hung to the corresponding positions of the net rack installed in the air by a crane, and the small units are connected with the net rack by high-altitude operation personnel.

The ground small unit is also called a triangular cone, namely a small unit formed by splicing a node ball and three to four rod pieces on the ground, the small unit is divided into a lower chord small unit and an upper chord small unit, and all the rod pieces are arranged and fastened in place at one time during ground splicing.

Every working face can divide into two parts with installer during high altitude suspension, and ground little unit is assembled to some, and the high altitude installation is carried out to another part, and the installation procedure is: firstly, ground assembling personnel assemble the net rack to be installed into small units on the ground according to the requirements of drawings, the small units are hung to the corresponding positions of the net rack installed in the air by a crane, and the small units are connected with the net rack by high-altitude operation personnel.

The ground small unit is also called a triangular cone, namely a small unit formed by splicing a node ball and three to four rod pieces on the ground, the small unit is divided into a lower chord small unit and an upper chord small unit, all the rod pieces are installed and fastened in place at one time during ground splicing, and when a screw hole which is difficult to install is found, a screw tap is applied, the screw hole is trimmed to be qualified, and then the screw hole is installed.

The small units are lifted to the installation positions by a crane, each connection point is accessed by an installer at a high altitude, the installer receives the corresponding installation rod piece and then connects the high-strength bolt with the bolt ball hole, the three-five buckles are screwed in firstly during primary connection, according to the installation conditions of other installers, after all the installation bolts enter the bolt ball, the high-strength bolts are fastened together, and therefore one high-strength bolt is avoided, the two high-strength bolts are fastened firstly, and other high-strength bolts are difficult to install in place.

After all the rod pieces are fastened in place, the tether can be unfastened, the hook is released, the next unit is installed, and the operation is repeated until all the installation work is completed.

The invention has the beneficial effects that:

(1) the integral net rack is installed by adopting a construction method combining a block installation method and a high-altitude bulk method;

(2) the construction method of a gable starting and deflection control method is utilized to complete the installation of the starting net rack;

(3) tensioning ropes and temporary supporting rods are additionally arranged in a segmented mode in the assembling process of the step frame, so that the designed camber and the overall dimension of the net rack are guaranteed; the other part of the net rack mounting method adopts a method of carrying out high-altitude scattered assembly towards one end by taking the walking frame as a reference.

(4) The net rack gable adopts a construction method of performing high-altitude splicing from one end to the other end.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic plan view of a rack;

FIG. 2 is a schematic view of the north elevation of the net mount;

FIG. 3 is a schematic view of the south elevation of the net mount;

FIG. 4 is a schematic east elevation view of a rack;

FIG. 5 is a schematic view of the west elevation of the net mount;

FIG. 6 is a schematic cross-sectional view of a rack;

FIG. 7 is a vertical plane position of the assembled gable foundation net rack;

FIG. 8 is a drawing showing

And

the installation schematic diagram of the shaft net rack and the gable net rack;

FIG. 9 is a schematic view of

A schematic installation diagram of the installation front vertical surface of the shaft arc-shaped foundation net rack;

FIG. 10 is a plan view of installation of the gable and the net rack with cambered surfaces at two sides;

FIG. 11 is a side elevation view of the installation of the gable and the net racks with cambered surfaces at two sides;

FIG. 12 is a side elevational view of the temporary support arrangement;

FIG. 13 is a schematic plan view of the arrangement of the guy rope and the dead man;

FIG. 14 is a schematic view of the position of the cable rope and the diagonal brace on the gable;

FIG. 15 is a schematic view of the use of the lever;

FIG. 16 is a schematic view of an assembled vertical surface of a basic grid structure;

FIG. 17 is a schematic side view of assembled gable foundation net racks;

FIG. 18 is a schematic view of a 100t crane as a temporary support;

FIG. 19 is a plan view of a 100t crane as a temporary support station;

FIG. 20 is a schematic side elevation view of a 100t crane mounted as a temporary support;

FIG. 21 is a schematic view of a 100t crane installed as a temporary support;

FIG. 22 is a schematic elevation view of a 100t crane mounted as a temporary support;

FIG. 23 is a schematic view of a second set of two 120t cranes being installed in cooperation;

FIG. 24 is a schematic view of a second set of two 120t crane mating mounting uprights;

FIG. 25 is a second set of two 120t crane station bitmaps;

FIG. 26 is a plan view of a second set of two 120t cranes for mating installation;

FIG. 27 is a schematic plan view of a third set of two 120t cranes cooperating to complete the final installation;

fig. 28 is a schematic view of the completed installation of the base net mount in cooperation with a second set of two 120t cranes;

FIG. 29 is a front elevation view of the completed installation of the base net mount;

figure 30 is a schematic view of a partially installed clerestory;

FIG. 31 is a schematic plan view of a base net rack fully installed;

FIG. 32 is a schematic view of the overhead installation of the rack;

FIG. 33 is a schematic view of the installation of the shaft gable.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 33, in order to make a person skilled in the art better understand the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

firstly, construction preparation;

secondly, basic measurement and rechecking;

thirdly, counting and sorting the approach components;

sixthly, performing item acceptance inspection on the installed net rack.

(2) after the gable support base plate and the embedded part are fixed in a spot welding manner, the gable support base plate and the embedded part are required to be fixed as soon as possible

In that

Both sides of the shaft

The arc-shaped net rack is installed and connected with the gable net rack, as shown in fig. 8-9;

(3) after the installation of the gable and the net rack layer on the cambered surfaces on the two sides is finished, a subsequent component of the gable and the net grid with the upper chord and the lower chord of the cambered surface on the two sides is installed under the coordination of a crane, the upper chord and the lower chord are both two grids, the installation height comprises that a support reaches 14.5m, the gable installation area is 14.5, 95 is approximately equal to 1378 square meters, and from the aspect of construction safety, the safe construction requirement cannot be met only by using the arc net racks on the two sides as supports of the gable net rack, cable wind ropes or inclined struts must be arranged on the two sides of the gable, the distance between the cable wind ropes is about 15.0m, and temporary supports should be arranged on the cambered surfaces on the two sides, as shown in FIGS. 10-14;

As shown in FIG. 15, the pull rod is used as a temporary support, the pull rod is a steel pipe with phi 377 x 10, the length of the steel pipe is 18-20 m, and the ear plate and the bottom plate are made of 20mmm rear steel plates according to the field condition.

(5) After the cable wind rope or the inclined strut is installed, the installation can be carried out

Shaft and

on both sides of the shaft

The shaft has three axes, the gable and the net racks on the two sides are installed, a 50t crane is needed to be installed in the process of installation, the three grids are installed on the upper chord and the lower chord of the installation at this time, the height is about 12m, and the total height is about 26m, as shown in FIGS. 16-17;

(6) the overhanging of the upper parts of the inner sides of the cambered net racks at two sides is relatively large, about 9.0m, the node space position reaches 26m, temporary supports are also needed to be arranged from the safety perspective, and the lower bowstring balls at the inner sides of the cambered net racks are respectively hung at two sides of the cambered surface by a 100t crane to be used as the temporary supports, so that the overhanging parts are prevented from being unexpected in subsequent installation, and the subsequent net racks are convenient to install, as shown in figures 18-22.

(7) After the two 100t cranes enter the working state, the cambered net rack and the gable are mutually supported, the subsequent installation is carried out under the coordination of the other two cranes, the installation is 4 grids, and due to the increase of the space height, the second group of mechanical supports adopt the two 120t cranes and also hang the lower chord ball on the inner side of the cambered net rack to finish the installation of the subsequent 4 grids, as shown in figures 23-24;

the second set of machine supports uses two 120t cranes due to the increase in space height. The next 4 mesh installations were also completed by lifting the lower chord balls inside the cambered net mount, as shown in fig. 25-26 below.

As described above, the third set of temporary supports, due to the increased height of the space, also uses a 120t crane as a temporary support, completing the final rack installation as shown in FIG. 27 below.

(8) The clerestory can be installed along with the basic net rack or independently as shown in fig. 30;

High-altitude bulk installation method

The high-altitude splice develops from the ridge part of the middle roof to the two sides so as to reduce the accumulated deviation and facilitate the elevation control. The overall installation sequence is that high altitude bulk loading is carried out from a standard net rack unit which is hoisted in place to two directions respectively, the high altitude bulk loading is carried out in a triangular sequence, the high altitude bulk loading is carried out, the high altitude and the high altitude bulk loading is carried out, the high altitude and the high altitude is carried out, the high altitude is gradually until the high altitude is crossed, the high altitude is gradually, the high altitude is carried out, the high. The effect of the high-altitude bulk implementation is shown in fig. 32.

The ground small unit is also called a triangular cone, namely a small unit formed by splicing a node ball and three to four rod pieces on the ground, the small unit is divided into a lower chord small unit and an upper chord small unit (as shown in figure 24), all the rod pieces are installed and fastened in place at one time during ground splicing, and when a screw hole which is difficult to install is found, the screw hole is trimmed to be qualified and then installed.

As shown in FIG. 33, the installation of the shaft gable portion is self-performed

The shaft begins to reciprocate up and down.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement, component separation or combination and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A construction method of a large-span column bolt ball joint net rack is characterized by comprising the following steps: the method comprises the following steps:

firstly, construction preparation;

secondly, basic measurement and rechecking;

thirdly, counting and sorting the approach components;

sixthly, performing item acceptance inspection on the installed net rack.

2. The construction method of the large-span stud ball joint net rack according to claim 1, wherein in the fourth step, the specific process of installing the bracket is as follows:

(3) after the installation of the gable and the net racks on the cambered surfaces at the two sides is finished, the subsequent components of the gable and the grids with upper and lower chords of the cambered surfaces at the two sides are installed under the coordination of a crane, the upper and lower chords of the gable are both two grids, the two sides of the gable are provided with guy cables or inclined struts in a pulling way, and the cambered surfaces at the two sides are provided with temporary supports;

(4) after the gable is installed to the 3 grids, cable wind ropes and anchor posts of the cable wind ropes are arranged;

(5) after the cable wind rope or the inclined strut is installed, other three shaft gable walls and net racks on two sides can be installed, and a 50t crane is adopted for matched installation in the installation process;

(6) the lower chord ball at the inner side of the cambered surface net rack is respectively hung on two sides of the cambered surface of the two side cambered surface net racks by a 100t crane to be used as temporary support, so that the accident of the overhanging part in the subsequent installation is avoided, the subsequent net rack is convenient to install, and the installation of the arched parts at two sides does not exceed 4 grids each time, namely 4 grids of the upper chord and the lower chord.

(7) After the two 100t cranes enter a working state, the cambered surface net rack and the gable are mutually supported, and subsequent installation is carried out under the coordination of the other two cranes, wherein the installation is 4 grid sizes;

(10) the subsequent net rack is installed by adopting an overhead bulk method, the net rack to be installed is spliced into small units on the ground, the small units are hung to the corresponding positions of the net rack installed in the air by a crane, and the small units are connected with the net rack by overhead workers.

3. The construction method of the large-span stud ball joint grid frame according to claim 2, characterized in that: the guy rope is made of steel wire ropes, the anchor ingots are arranged on a fixed building, when the building is fixed in an unfixed place, ground anchor piles are driven on the ground, the ground anchor piles are driven into the ground by steel bar hooks and are inclined by 45 degrees, the depth of the ground anchor piles is not less than 1.0 meter, the guy rope is tensioned by basket bolts, and five groups of guy ropes are arranged due to the fact that the lattice columns are high, and each group is two.

4. The construction method of the large-span stud ball joint grid frame according to claim 1, characterized in that: before the crane starts to hoist, in order to avoid the overturning of the crane caused by the settlement of the foundation, a steel plate is required to be arranged below the crane supporting legs.