CN100504032C - Reinforcing bar cage hoisting process for canal wall construction - Google Patents

Abstract

The present invention relates to tunnels, in particular to a method for hoisting reinforcement cages used in tunnel wall construction during tunnel engineering construction. The connection method can realize the repeated use of the truss while ensuring the hoisting rigidity of the steel cage. Its advantages are large structural rigidity, small deformation, detachable, convenient disassembly and assembly, and can be reused.

Description

Hoisting method of reinforcement cage in tank wall construction

technical field

The invention relates to tunnels, in particular to a method for hoisting a reinforcement cage used in tunnel wall construction during tunnel engineering construction.

Background technique

The groove wall construction method has been widely used in tunnel engineering construction all over the world due to its unique advantages. In recent years, Beijing, Shanghai, Guangzhou, Tianjin, Shenzhen and other large and medium-sized cities in my country have started the construction of large-scale rail transit systems with subways as the main body. my country has made great progress in the construction technology of groove walls. Fabrication and hoisting of reinforcement cages is an important link in the construction process of the tank wall. A practical and reasonable method of fabrication and hoisting of reinforcement cages can make the entire construction process of the tank wall faster, more effective, safer and more economical.

In the construction of the tank wall, it is required to be used as a tank machine to complete the tank section and clear the bottom, then hoist it into a steel cage, and then pour underwater concrete on it to form an underground wall. In order to ensure that the reinforcement cage is safely and smoothly hoisted into the trough section, longitudinal and horizontal trusses for lifting are usually welded on the reinforcement cage to increase the rigidity of the reinforcement cage and prevent it from being deformed and falling apart during hoisting. Although this construction method can safely hoist the steel cage, the truss used for lifting the steel cage cannot be taken out after the steel cage is put into the groove, and there is no possibility of repeated use. At the same time, the power consumption of the truss is equivalent to the number of welding electrodes Larger, and increase the labor intensity of the welders, it is more likely to prolong the construction period.

Contents of the invention

The object of the present invention is to provide a method for hoisting reinforcement cages in tank wall construction according to the deficiencies of the above-mentioned existing technologies. , while ensuring the hoisting rigidity of the steel cage, the truss can be reused.

The object of the present invention is realized by the following technical solutions:

A method for hoisting reinforcement cages in tank wall construction, characterized in that the method adopts the following steps: A. preparation of trusses, including the manufacture of longitudinal and transverse trusses; B. assembly of trusses and reinforcement cages, including binding of reinforcement cages and trusses The assembly; C. The steel cage is hoisted into the groove, and the truss is removed.

The manufacture of the longitudinal truss is to select the upper and lower channel steels, and set the channel steels between them to be wavy, wherein the upper and lower channel steels are respectively welded and fixed with the wavy channel steels.

The fabrication of the transverse truss is to select two channel steels.

The assembly of the truss and the steel cage refers to that after the bottom plate of the steel cage is set, at least two longitudinal trusses are placed sideways on both sides of the bottom plate, and then the binding of the steel cage is completed, and then along the length direction of the longitudinal truss, at least one The transverse truss is arranged between two longitudinal trusses, and the two ends of the transverse truss are fixedly connected with the longitudinal truss respectively.

The two channel steels in the transverse truss are arranged in parallel, and the upper and lower channel steels of the longitudinal truss are clamped and fastened by setting several fastening screws between the two channel steels.

The two channel steels in the transverse truss are arranged horizontally, and at least one set of two cross channel steels is arranged between the two channel steels.

The assembly of the trusses and the reinforcement cages also includes that when the longitudinal trusses are connected and extended along the longitudinal direction, the trusses are connected and fixed by steel pins.

Several hanging points are arranged on the top surface of the upper channel steel of the longitudinal truss.

Said reinforcement cage is hoisted into the groove, and the removal of the truss refers to: when the reinforcement cage and the truss are erected into the groove and lowered, that is, one end of the longitudinal truss enters the groove first, and at the same time, the horizontal trusses supporting the longitudinal truss are removed one by one during the lowering process. , and finally when the reinforcement cage is fixed in place, take out the longitudinal trusses on both sides of the reinforcement cage respectively.

The advantages of the present invention are: (1) the characteristics of detachable and reusable, the truss can be taken out after the reinforcement cage is inserted into the slot and is used for the production of the lower reinforcement cage, and has reusable performance, compared with The ordinary steel truss in the past effectively reduced the waste of unnecessary steel and thus controlled the cost; (2) The characteristics of high rigidity and small deformation, the truss is composed of channel steel, which is much harder than the truss welded with steel bars in the past , It can better ensure that the steel cage will not be deformed during lifting, and ensure the safe lifting of the steel cage. Moreover, the trusses are all processed and manufactured by the factory, and have strict quality acceptance standards, and the quality can be guaranteed; (3) The characteristics of easy disassembly and assembly, the trusses are assembled, and are connected by steel pins and fastening screws It does not need to be welded by electric welding, which reduces the damage of raw materials, so it is very convenient to disassemble and assemble, thus speeding up the production progress of the steel cage.

Description of drawings

Accompanying drawing 1 is the three-dimensional structure schematic diagram of the present invention;

Accompanying drawing 2 is the schematic diagram of longitudinal truss structure of the present invention;

Accompanying drawing 3 is a schematic diagram of the transverse truss structure in the embodiment (the channel steel is arranged crosswise);

Accompanying drawing 4 is the schematic diagram of transverse truss structure in the embodiment (channel steel is arranged in parallel);

Accompanying drawing 5 is the hoisting plane view of glass fiber reinforcement cage in the embodiment;

Accompanying drawing 6 is the lifting elevation view of glass fiber reinforcement cage in the embodiment;

Accompanying drawing 7 is the schematic diagram of transverse truss reinforcement at glass fiber bar place in the embodiment;

Accompanying drawing 8 is a schematic diagram of the partial structure of the steel pin connection end of the longitudinal truss of the present invention;

Accompanying drawing 9 is the schematic diagram of the structure of the movable suspension point of the present invention;

Detailed ways

The features of the present invention and other related features will be further described in detail below in conjunction with the accompanying drawings through embodiments, so as to facilitate the understanding of those skilled in the art:

As shown in Figure 1-9, the labels 1-27 respectively represent: connecting steel bolt 1, longitudinal truss 2, wave channel steel 3, transverse truss 4, transverse truss fastening bolt 5, connecting steel pin between trusses 6, movable crane Point 7, longitudinal truss 8, longitudinal truss 9, pulley 10, truss hoisting structure 11, steel cage 12, transverse truss I13, transverse truss II14, transverse truss III15, transverse truss IV16, transverse truss V17, fastening screw 18, upper slot Steel 19, lower channel steel 20, channel steel I21, channel steel II22, channel steel 23, channel steel 24, steel pin connection hole 25, longitudinal truss protruding tongue 26, No. 8 iron wire 27.

What this embodiment relates to is a kind of hoisting method of glass reinforcement cage 12 in the construction of groove wall, and this method adopts the following steps:

A. Preparation of trusses, including the fabrication of longitudinal and transverse trusses;

Production of longitudinal truss: as shown in Figure 2 and Figure 8, each section of longitudinal truss 2, 8, and 9 is made of 16# channel steel upper channel steel 19 and lower channel steel 20 respectively, and the middle is arranged in waves by 10# channel steel Shaped channel steel 3, wherein upper and lower channel steels 19, 20 are welded and fixed with corrugated channel steel 3 respectively. The connection between the trusses of the longitudinal trusses 2, 8, 9 is carried out with steel pins through the steel pin connection holes 25 on the tongue 26 of the longitudinal trusses.

A movable hanging point 7 is arranged on the top surface of the upper channel steel 19 of the longitudinal trusses 2, 8, 9.

The structure of the movable lifting point 7 is to use round steel to set a chute in the longitudinal truss. The movable lifting point can pull out the upper ring when hoisting as required or the entire movable lifting point can be retracted into the longitudinal truss during disassembly so that the entire longitudinal truss meets the requirements. its detachability.

Production of horizontal trusses: As shown in the figure, prepare several 10# channel steels 21 and 22 and 8# channel steels 23 and 24 according to the number of horizontal trusses installed.

As shown in FIG. 1 , in this embodiment, two-section longitudinal trusses 2 , two-section longitudinal trusses 8 , two-section longitudinal trusses 9 , and channel steel forming five-section transverse trusses 4 need to be provided.

B. Assembly of truss and reinforcement cage, including binding of reinforcement cage and assembly of truss;

The assembly of the truss and the steel cage refers to that after the bottom plate of the steel cage is set, the three longitudinal trusses 2, 8, and 9 on each side are connected and stand sideways on both sides of the bottom plate, and then the binding of the steel cage 12 is completed. In the length direction, five sections of transverse trusses are set: transverse truss I13, transverse truss II14, transverse truss III15, transverse truss IV16, and transverse truss V17, as shown in Figure 5 and Figure 6.

Therefore, as shown in Figure 3, the transverse truss I13, transverse truss III15, transverse truss IV16, and transverse truss V17 are respectively composed of channel steel I21 and channel steel II22. The channel steels 23, 24 are respectively fastened with the channel steels 21, 22 by fastening bolts, and the channel steel I21, the channel steel II22 and the upper channel steel 19 and the lower channel steel 20 of the longitudinal truss are fixedly connected by the fastening bolts 5.

As shown in Figure 4, the transverse truss II14 is composed of channel steel I21 and channel steel II22. Connect, and by setting five fastening bolts 18, make it clamp and fasten the longitudinal truss.

The horizontal trusses arranged crosswise are used for ordinary steel cages, and those arranged in parallel are used for glass fiber cages.

In this embodiment, two cross-shaped channel steels 23, 24 and horizontal 10# channel steels 21, 22 are placed in the middle of the longitudinal truss to make the whole truss form a whole. Fastening screw 18 clamps it, prevents twisting and deformation of the steel bar here because of stress unevenness when hoisting.

As shown in Figure 7, the top of the longitudinal truss at the glass fiber reinforcement is welded to the steel plate at the top of the steel cage, and the tail is welded to the steel cage. The length of the weld is 10 cm. The horizontal truss at the glass fiber reinforcement is passed through by 5 fastening screws 18. It is composed of upper and lower channel steel, with 32-diameter rebar as shear support in the middle, welded with longitudinal trusses, and horizontal trusses are installed every 4m.

C. The reinforcement cage is hoisted into the groove, and the truss is removed.

Since the truss is fixed to the steel cage, the top of the longitudinal truss is connected with the connecting steel bolt 1 and the 3cm steel plate at the top lifting point. After the lowering of the steel cage is completed, the steel plate is cut off by fire welding, and then the entire channel steel truss is taken out by a crane. The details are as follows:

The glass fiber reinforced cage and the truss structure are hoisted simultaneously by the main hoist and the auxiliary hoist. First hoist horizontally and leave the platform for 20-50 cm, then raise the main hoist and place the auxiliary hoist. The main crane lifts the hook slowly within the working radius, and at the same time, the auxiliary crane moves slowly forward synchronously, until the steel cage and the truss are hoisted upright, the auxiliary crane is automatically released, the hook of the auxiliary crane is removed, and then the main crane hangs The vertical reinforcement cage rotates within the working radius to the exact position and then slowly lowers.

When the reinforcement cage is lowered into the groove, the welding seam between the bottom of the truss and the reinforcement cage shall be cut open by fire welding. At the lifting point of the truss, after removing the shackle, push the movable lifting point inward, and finally make the lifting point and the longitudinal truss form a plane, so as to ensure that the lifting point does not hinder the extraction of the longitudinal truss, and finally when the reinforcement cage is fixed in place Finally, cut the weld seam between the top of the longitudinal truss and the weld of the steel plate, and take out the longitudinal trusses on both sides of the reinforcement cage in turn.

Apparently, those skilled in the art can easily understand that in practical applications, without departing from the protection scope of the present invention, various improvements can be made to this embodiment. The relative positions and connection methods of each component, etc., can be determined according to specific engineering needs, and will not be repeated here.

The practical problem that the present invention solves is:

1. Reduce waste and control costs:

This kind of truss can be reused. Compared with the past truss, it cannot be taken out after the steel bar is caged into the groove, which reduces unnecessary waste. In the past, the steel bars used to make trusses were basically 15kg/m3~18g/m3. Now, using this special truss can save the cost of this part of steel bars, and at the same time reduce electricity consumption and the number of welding electrodes, thus effectively controlling the reinforcement cage. Production costs.

2. Improve the safety of hoisting large steel cages:

This kind of truss is composed of 16# and 10# channel steel, and its strength is far greater than that of ordinary steel bars, so its rigidity is very large and its deformation is small. When it is used for hoisting large steel cages, it can improve the safety guarantee factor and prevent large steel cages from Phenomena such as falling apart and deformation occur during the lifting process.

3. Reduce the labor intensity of steel cage manufacturers:

When making a steel cage, welders not only have to weld the various components of the steel cage, but also focus on welding the trusses used for lifting the steel cage to ensure the lifting rigidity, and the fatigue of the welders is quite large. If this special assembled truss is used, there is no need for truss welding, which greatly reduces the labor intensity of the welder and provides a guarantee for the welder to get enough rest and work better.

Claims (4)

1. reinforcing bar cage hoisting process in the canal wall construction, it is characterized in that this method adopts following steps: the preparation of A. truss comprises the making of vertical and horizontal truss; B. the assembling of truss and reinforcing cage comprises the colligation of reinforcing cage and the assembling of truss; C. reinforcing cage and truss lift together into groove, and carry out the dismounting of truss; The making of described longitudiual truss is to select upper and lower channel-section steel, and the waveform channel-section steel is set between the two, and is wherein that upper and lower channel-section steel is fixing with the welding of waveform channel-section steel respectively; The making of described transverse truss is to select two channel-section steels, and two channel-section steels in the described transverse truss be arranged in parallel, wherein clamps the upper and lower channel-section steel of longitudiual truss fastening by several holding screws are set between two channel-section steels; The assembling of described truss and reinforcing cage refers to after the reinforcing cage base plate sets, at least two joint longitudiual truss are edge-on in the base plate both sides, finish the colligation of reinforcing cage afterwards, the length direction of truss longitudinally again, at least transverse truss being arranged between the two joint longitudiual truss at a place, fixedlys connected with longitudiual truss respectively in the two ends of transverse truss; Described reinforcing bar cage hoisting is gone into groove, and the dismounting of carrying out truss refers to: reinforcing cage and truss are erect when transferring into groove, an end that is longitudiual truss is gone into groove earlier, to support simultaneously the transverse truss of longitudiual truss in transferring process removes one by one, at last behind the reinforcing cage fix in position, with the longitudiual truss taking-up respectively successively of reinforcing cage both sides.

2. according to reinforcing bar cage hoisting process in claim 1 described a kind of canal wall construction, it is characterized in that two channel-section steels in the described transverse truss are horizontally disposed with, wherein between two channel-section steels one group of two channel-section steel arranged in a crossed manner is set at least.

3. according to reinforcing bar cage hoisting process in claim 1 described a kind of canal wall construction, it is characterized in that the described truss and the assembling of reinforcing cage also comprise between the longitudiual truss longitudinally being connected when extending, and are connected and fixed by steel pin between truss and the truss.

4. according to reinforcing bar cage hoisting process in claim 1 described a kind of canal wall construction, it is characterized in that the last channel-section steel end face of described longitudiual truss is provided with some suspension centres.

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