CN116005646A - Abnormal-shaped underground diaphragm wall reinforcement cage and hoisting construction method thereof - Google Patents

Abstract

The invention discloses a special-shaped underground continuous wall reinforcement cage which is a reinforcement cage with a Z-shaped horizontal section, wherein the Z-shaped reinforcement cage is formed by splicing two reinforcement cages with L-shaped horizontal sections, and the L-shaped reinforcement cage comprises a vertical main rib and a horizontal rib surrounding the main rib; the inner part of the L-shaped steel reinforcement cage is reinforced by welding X-shaped truss ribs, and the outer side surface of the L-shaped steel reinforcement cage is reinforced by welding scissors ribs; a sound detection pipe and a grouting pipe are also arranged in the L-shaped reinforcement cage; the invention further discloses a hoisting method of the special-shaped underground diaphragm wall reinforcement cage, wherein steel plates are pre-buried at the positions of the structural reverse-made plates of the L-shaped reinforcement cage, straight ribs are welded on the outer walls of the steel plates, L-shaped beard ribs are welded on the outer side surfaces of the two sides of the steel plates of the L-shaped reinforcement cage. The special-shaped underground diaphragm wall reinforcement cage can be quickly and accurately placed into the designed hole depth in the groove, and is safe to operate and high in efficiency.

Description

Abnormal-shaped underground diaphragm wall reinforcement cage and hoisting construction method thereof

Technical Field

The invention relates to the field of underground continuous wall construction. More particularly, the invention relates to a special-shaped underground continuous wall reinforcement cage and a hoisting construction method thereof.

Background

The underground continuous wall is generally adopted as the enclosure structure of the foundation pit in the construction process of the urban underground space under the limit of the construction site. The common underground diaphragm wall unit groove section mainly has a structure form of 'one' -type, a 'T' -type and a 'Z' -type. The Z-shaped unit groove section has the most complex structure and the greatest construction difficulty, but has good overall effect. The Z-shaped diaphragm wall of the Z-shaped groove section needs to be prefabricated with a Z-shaped steel reinforcement cage in the construction process, and then the steel reinforcement cage is hoisted into the Z-shaped groove section of the pre-excavated diaphragm wall. However, at present, a safer and more effective manufacturing and hoisting process does not exist for the wall-connected reinforcement cage of the Z-shaped groove section.

Disclosure of Invention

It is an object of the present invention to solve at least the above problems and to provide at least the advantages to be described later.

The invention also aims to provide the special-shaped underground diaphragm wall reinforcement cage and the hoisting construction method thereof, which can accurately place the special-shaped underground diaphragm wall reinforcement cage into the designed hole depth in the groove, and are safe to operate and high in efficiency.

To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a profiled underground diaphragm wall reinforcement cage which is a reinforcement cage having a horizontal section in a Z-shape, the Z-shaped reinforcement cage being formed by splicing two reinforcement cages having a horizontal section in an L-shape, the L-shaped reinforcement cage including a vertical main rib and a horizontal rib surrounding the main rib;

the inner part of the L-shaped steel reinforcement cage is reinforced by welding X-shaped truss ribs, and the outer side surface of the L-shaped steel reinforcement cage is reinforced by welding scissors ribs; a sound detection pipe and a grouting pipe are also arranged in the L-shaped reinforcement cage; the L-shaped steel reinforcement cage is embedded with a steel plate at the position of a structural reverse plate, the outer wall of the steel plate is welded with straight ribs, the outer side surfaces of the L-shaped steel reinforcement cage, which are positioned at two sides of the steel plate, are welded with L-shaped beard ribs, and the L-shaped steel reinforcement cage is embedded with a straight thread connector at the position of a bottom plate; pre-buried bars for connecting with the crown beam are reserved at the top of the L-shaped reinforcement cage; diagonal bracing ribs for enhancing the rigidity of the horizontal section of the reinforcement cage are arranged at the inner corners of the L-shaped reinforcement cage; and a hanging ring is arranged at a pre-calculated hanging point position on the L-shaped steel reinforcement cage.

Preferably, the two main ribs coaxial on the same warp at the junction of the L-shaped steel reinforcement cage and the plain concrete section are connected by welding, and the two main ribs coaxial on the same warp at other positions of the L-shaped steel reinforcement cage are connected by adopting a straight thread sleeve; the main reinforcement and the stirrup are welded and connected, and the number of the cross spot welds is not less than 50% of the total number of the crossing points of the main reinforcement and the stirrup.

Preferably, the grouting pipe adopts a steel pipe with the outer diameter of 32mm, the wall thickness of 3.5mm and the material Q235B, and the steel pipe is lifted to the ground;

each wall of the sound measuring tube is provided with 5 sound measuring tubes which are arranged according to a W shape, the outer diameter of the sound measuring tube is 50mm, the wall thickness is 1.5mm, a screw thread joint is adopted at the joint, the wall thickness at the joint is 3mm, and the distance between two adjacent sound measuring tubes is not more than 1.5m.

Preferably, the sizes of the steel plates are 1000 multiplied by 1400 multiplied by 16mm, the distance between two adjacent steel plates is 3m, 25 phi 18 straight ribs are uniformly distributed on the outer wall of each steel plate, the length of each side of each Huzi rib is 35d, and the model of each Huzi rib is phi 16@450 multiplied by 450.

The invention also provides a hoisting construction method of the special-shaped underground continuous wall reinforcement cage, which comprises the following steps:

step one, commanding the two cranes of the main crane and the auxiliary crane to be transferred to a hoisting position, and respectively installing shackles of hoisting points in a hoisting work;

step two, carefully checking the reinforcement cage before hoisting, and after checking the installation condition and the stress gravity center of the two crane steel wire ropes, starting to hoist horizontally at the same time without sundries except the reinforcement cage;

thirdly, performing test hanging, namely after the steel reinforcement cage is hung to be 200mm away from the ground, standing for 5 minutes, closely paying attention to whether a hanging point, the steel reinforcement cage and a reinforcing point are changed at the moment, immediately placing the steel reinforcement cage on the ground if potential safety hazards exist, re-reinforcing, lifting a hook after the steel reinforcement cage is inspected to be qualified, and commanding the auxiliary machine to be matched with the lifting hook at any time according to the distance between the tail part of the steel reinforcement cage and the ground;

step four: tilt lift

(1) The auxiliary crane keeps the position of the reinforcement cage 1m away from the ground unchanged; the main crane lifts, and simultaneously the main crane and the auxiliary crane rotate the large arm along with the direction of the reinforcement cage to enable the reinforcement cage to incline;

(2) the main crane hook continues to lift, and the auxiliary crane keeps a distance from the ground of 200-500mm until the reinforcement cage is vertically lifted;

step five, removing the auxiliary hanging pulley

After the steel reinforcement cage is in a vertical state, stopping for 3 minutes, after the steel reinforcement cage is completely stopped, commanding a crane to remove a steel wire rope on a shoulder pole of the auxiliary crane, and then keeping away from the hoisting operation range, wherein the distance between the bottom end of the steel reinforcement cage and the ground is not more than 0.5m in the crane walking process;

step six, commanding the main crane cage to enter the groove and positioning, wherein the crane is stable in running, and the traction rope is pulled on the reinforcement cage and cannot be forced to enter the groove when being lowered; in the running process, the speed of the steel bar cage is not more than 1km/h, at least 2 guide ropes are required to be arranged on the steel bar cage in the running process, and the guide ropes form an angle of 120 degrees with each other, so that the stability of the steel bar cage in the running process is ensured;

and step seven, measuring the height after the reinforcement cage is lowered in place, and ending the lowering process after meeting the requirements.

Preferably, before the first step, the method further comprises:

step a, carrying out test hanging on the reinforcement cage: hoisting the reinforcement cage away from the working platform, observing the deformation condition of the reinforcement cage when the steel wire rope is tightened and reaches a full-load stress state, and analyzing the feasibility of the next hoisting; when the steel reinforcement cage is lifted by 200mm, observing the deformation condition of the steel reinforcement cage, and if the steel reinforcement cage is seriously deformed and is not suitable for re-lifting, immediately stopping lifting; when the steel reinforcement cage is lifted by 0.2 m-0.5 m, the deformation condition of the steel reinforcement cage is observed again, the deformation condition of the steel reinforcement cage and the state of hoisting equipment are good, and the steel reinforcement cage can be operated in a descending way under a controllable state;

step b, analyzing the test hoisting result: if the deformation is too large in the lifting process of the reinforcement cage, researching the reinforcement cage together with a design unit and a supervision unit, reinforcing the integrity of the reinforcement cage, and modifying and optimizing a construction scheme; if the steel reinforcement cage is successfully lifted, various working conditions in the lifting process are analyzed and summarized to be used as follow-up construction guidance, and meanwhile, optimization suggestions are provided for a design unit.

The invention at least comprises the following beneficial effects: the steel reinforcement cage for the engineering is manufactured in a whole mode, is lifted into the groove in sections, and is reinforced integrally for guaranteeing rigidity and strength when the steel reinforcement cage is lifted. According to the design requirements and site construction conditions, the reinforcement cage adopts a construction method of section hoisting and splicing into a groove, and adopts a reliable and effective hoisting construction scheme, namely, theoretical calculation meets the requirements and the hoisting scheme meets the safety construction requirements, so that the special-shaped underground continuous wall reinforcement cage can be quickly and accurately placed into the groove to design the hole depth, and the operation is safe and the efficiency is high.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic top view of a profiled underground diaphragm wall reinforcement cage according to the present invention;

fig. 2 is a schematic view of a scissor bar on a profiled diaphragm wall reinforcement cage according to the invention;

FIG. 3 is a schematic view of truss ribs in a profiled diaphragm wall rebar cage according to the present invention;

fig. 4 is a schematic view of grouting pipes in the special-shaped underground diaphragm wall reinforcement cage of the invention;

FIG. 5 is a schematic view of a sound tube in a profiled diaphragm wall rebar cage according to the present invention;

FIG. 6 is a schematic view of embedded steel plates and beard ribs in the special-shaped diaphragm wall reinforcement cage of the invention;

fig. 7 is a schematic hoisting view of a cross section of the special-shaped underground diaphragm wall reinforcement cage according to the invention;

fig. 8 is a schematic diagram of a stress bending moment of a cross section of the reinforcement cage of the special-shaped underground continuous wall;

fig. 9 is a transverse hanging point layout of the special-shaped underground diaphragm wall reinforcement cage of the invention;

fig. 10 is a schematic view of a longitudinal stress bending moment of the reinforcement cage of the special-shaped underground continuous wall according to the invention;

fig. 11 is a schematic diagram of the hoisting of the special-shaped underground diaphragm wall reinforcement cage according to the invention;

fig. 12 is a schematic view of the abnormal-shaped underground diaphragm wall reinforcement cage according to the present invention when it is upright.

Detailed Description

The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.

It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the reagents and materials, unless otherwise specified, are all commercially available; in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention.

In the construction process of the Beijing Tang inter-city, the manufacturing drawing of the reinforcement cage is determined according to the concrete conditions of the groove section according to the reinforcement cage design drawing. The horizontal section shape of the reinforcement cage is manufactured and formed according to the shape of the groove section, and the length of the reinforcement cage is matched with the depth of the groove section and is 50cm away from the bottom of the groove. The reinforcement cage manufacturing is uniformly completed on the erected reinforcement cage manufacturing platform.

The steel reinforcement cage manufacturing platform adopts 300mm thick C30 concrete to harden, and the bed-jig adopts No. 10 channel-section steel and steel reinforcement welding to become the grid, and the steel reinforcement lofting of being convenient for arranges and the ligature draws control mark according to the design position of the reinforcing bar interval of design, dowel, built-in fitting on the platform to guarantee the laying precision of steel reinforcement cage and various built-in fitting. The bar processing machine equipment is compactly arranged between and around the bar processing machine equipment. The processing platform should guarantee that the mesa is level, and four angles should become the right angle to guarantee that the reinforcing bar can pinpoint and the reinforcing bar cage standard is horizontal vertical when the reinforcing bar cage processing, the reinforcing bar interval accords with norm and design requirement. The platform was calibrated relatively high Cheng Caiyong level.

As shown in fig. 1, the invention provides a special-shaped underground continuous wall reinforcement cage, wherein the special-shaped underground continuous wall reinforcement cage is a reinforcement cage with a Z-shaped horizontal section, the Z-shaped reinforcement cage is formed by splicing two reinforcement cages with L-shaped horizontal sections, and the L-shaped reinforcement cage comprises a vertical main reinforcement and a horizontal reinforcement surrounding the main reinforcement;

the inner part of the L-shaped steel reinforcement cage is reinforced by welding X-shaped truss ribs, and the outer side surface of the L-shaped steel reinforcement cage is reinforced by welding scissors ribs; a sound detection pipe and a grouting pipe are also arranged in the L-shaped reinforcement cage; the L-shaped steel reinforcement cage is embedded with a steel plate at the position of a structural reverse plate, the outer wall of the steel plate is welded with straight ribs, the outer side surfaces of the L-shaped steel reinforcement cage, which are positioned at two sides of the steel plate, are welded with L-shaped beard ribs, and the L-shaped steel reinforcement cage is embedded with a straight thread connector at the position of a bottom plate; pre-buried bars for connecting with the crown beam are reserved at the top of the L-shaped reinforcement cage; diagonal bracing ribs for enhancing the rigidity of the horizontal section of the reinforcement cage are arranged at the inner corners of the L-shaped reinforcement cage; and a hanging ring is arranged at a pre-calculated hanging point position on the L-shaped steel reinforcement cage.

Specifically, the processing and the installation of the reinforcement cage reinforcement are carried out according to a construction design drawing, the main reinforcement is connected by adopting a straight thread sleeve, and the main reinforcement at the junction of the main reinforcement and the plain concrete section is connected by adopting welding; when welding between the vertical steel bar and the horizontal steel bar, the vertical steel bar and the horizontal steel bar are welded firmly by spot welding, and the number of the cross spot welding is not less than 50 percent of the total number. And all the crossing points of the main ribs and the transverse ribs of the edges around the cage body are welded. Important parts such as trusses, hanging rings and the like are strictly checked and controlled in the processing process of the reinforcement cage, so that the full welding seams and the welding length are ensured to meet the requirements.

In order to ensure the thickness of 7cm outside and 7cm inside the reinforcement cage protective layer, the reinforcement cage is provided with protective irons, the protective irons are steel plates with the thickness of 5mm, the horizontal spacing is 2.0m, the vertical spacing is 3.0m, and the positions of the protective irons can be properly adjusted when the protective irons meet the embedded parts; the steel bar ensures straight and clean surface without greasy dirt.

The Z-shaped irregular-width reinforcement cages are divided into 2L-shaped reinforcement cages to be processed, 28 reinforcement X-shaped reinforcement welding is used for reinforcing the inside, 28 reinforcement oblique welding is used for reinforcing the outer side face, and L-shaped reinforcement welding is used for reinforcing the hanging point position.

As shown in fig. 2 to 3, specifically, the outer side of the reinforcement cage is provided with an X-shaped reinforced scissor rib, and the inner side of the reinforcement cage is provided with a truss rib for reinforcement.

As shown in fig. 4, specifically, the grouting pipe adopts a steel pipe with an outer diameter of 32mm, a wall thickness of 3.5mm and a material Q235B, and the steel pipe is lifted to the ground;

as shown in FIG. 5, 5 sounding pipes are arranged on each wall, the sounding pipes are arranged in a W shape, the outer diameter of each sounding pipe is 50mm, the wall thickness of each sounding pipe is 1.5mm, a screwed joint is adopted at the joint, the wall thickness of each sounding pipe is 3mm, and the distance between two adjacent sounding pipes is not more than 1.5m.

As shown in FIG. 6, the sizes of the steel plates are 1000×1400×16mm, the distance between two adjacent steel plates is 3m, 25 phi 18 straight ribs are uniformly distributed on the outer wall of the steel plate, each side of each of the beard ribs is 35d, and the model of each of the beard ribs is phi 16@450×450. The position of the connector with the embedded steel plate can cancel the beard ribs.

Specifically, the local reinforcement measures of the L-shaped reinforcement cage are as follows:

according to actual conditions, when defects appear in the manufacture of the reinforcement cage or stress concentration exists at the rest positions, the L-shaped short reinforcement heads can be used for connecting the corresponding positions, and the L-shaped short reinforcement heads are arranged by fully utilizing the compressive resistance of the short reinforcement during connection. Besides the vertical and horizontal lifting trusses and lifting points, the angle-turning steel reinforcement cage and the special steel reinforcement cage are additionally provided with a herringbone truss and diagonal braces for reinforcement so as to prevent the steel reinforcement cage from deforming when turning over at an angle in the air.

The underground diaphragm wall W5-L01 reinforcement cage of the Beijing Tang core area is an L-shaped reinforcement cage with an angle of 94 degrees, the cage length is 51.5 meters, and the weight of the reinforcement cage is 48 tons. The steel reinforcement cage is lifted by adopting a transverse 3+1 lifting method and a longitudinal six-row lifting method, and then the steel reinforcement cage is lifted and checked:

1. checking calculation of steel reinforcement cage layout hanging points

The L-shaped cage transverse hanging points are different from the horizontal cage arrangement, the steel reinforcement cage cross section hanging points adopt three rows of hanging points in the horizontal plane and one row of hanging points in the vertical plane, so that the safety of the cage lifting process and the steel reinforcement cage vertical to each other in the cage walking process are ensured, as shown in fig. 7.

(1) Checking calculation of transverse hanging point

Because the W5-L02 steel reinforcement cage is distributed by referring to the horizontal hanging points, steel wire ropes are arranged on two sides of the vertical wall position of the L-shaped steel reinforcement cage, and hanging points are only checked and calculated on the horizontal wall position. The transverse wall is 2.44 m in position, and two-point hoisting is to be adopted. According to the law of moment balance, the principle that the deformation of the bending moment is minimum when the positive bending moment and the negative bending moment are equal (as shown in fig. 8) is calculated as follows:

+M＝-M

+M＝(1/2)qL ₁ ² ；-M＝(1/8)qL ₂ ² -(1/2)qL ₁ ²

q is uniform load, and M is bending moment.

From the following components

2L ₁ +L ₂ =2.44, give L ₁ ≈0.51，L ₂ ≈1.4；

Considering the whole reinforcement cage, the vertical wall is heavy. Reproduction according to the force-receiving position analysis, the transverse hanging point arrangement of the reinforcement cage is shown in fig. 9.

(2) Checking and calculating longitudinal hanging point

The longitudinal stress bending moment of the reinforcement cage is shown in fig. 10.

The principle of minimum bending moment deformation when the positive bending moment and the negative bending moment are equal is adopted to obtain the following formula:

+M＝-M；

wherein: +m= (1/2) ×qm ² ；

－M＝(1/8)*qn ² －(1/2)*qm ² ；

Therefore:

2 m+5n=51.5;

obtaining: n.apprxeq.9.02, m.apprxeq.3.19.

Therefore, the bending moment is minimum when b, c, d, e, f, g is selected for hoisting, b, c and d are main hoisting positions in the actual hoisting process, and e, f and g are auxiliary hoisting positions. According to technical data and actual hoisting experience provided by a design institute and the actual length of a steel wire rope, b needs to move to a by 2m, positions of c, d, e and f are properly fine-tuned, the distance between the main crane and the auxiliary crane is reduced to 8m, and the distance of gh is correspondingly adjusted to 4.5m. The hanging point distances are 1m, 10m, 8m, 9m and 4.5m respectively.

2. Wire rope checking calculation

The diameter of the main steel wire rope is 38mm, the sum Pg=891kN of the breaking force of the steel wire is found, and the allowable pulling force of the steel wire rope is 891 multiplied by 0.82/6=121 kN.

When in hoisting, the maximum weight borne by the main steel wire rope is 48t. 8 steel wire ropes are hung under the main hanging carrying pole, 8 steel wire ropes are stressed when the main hanging carrying pole is in a vertical state, and the stress of a single steel wire rope is t1=48/8=6t < 12.1T.

The calculated 38mm steel wire rope is used as the lower lifting rope of the main lifting shoulder pole to meet the requirement.

The diameter of the auxiliary steel wire rope is 48mm, the sum Pg=1420 kN of the breaking force of the steel wire is found, and the allowable pulling force of the steel wire rope is 1420 multiplied by 0.82/6=194.1 kN.

When the reinforcement cage is hoisted, the maximum weight borne by the steel wire rope under the auxiliary hoisting shoulder pole is 80% of the weight of the reinforcement cage when the reinforcement cage with the length of 51.5m is hoisted by a double crane, and the dynamic load is calculated according to 1.05: a sling weight of 48 x 0.8 x 1.05=40.32 t is required. When the hoisting is stressed, 3 steel wire ropes are hung under the auxiliary hoisting shoulder pole, 6 steel wire ropes are totally hung, and the stress of a single steel wire rope is realized: t=40.32++6=6.72t < 12.1T (rope acceptable tension).

The main steel wire rope and the auxiliary steel wire rope meet the hoisting requirement.

3. Shackle checking calculation

Calculating the stress of each shackle at the position of a lifting point of the main crane reinforcement cage to be 48/12=4t; so the main crane selects 12 20t shackle. Meets the requirements.

Calculating the maximum stress of each shackle at the position of a lifting point of the auxiliary crane reinforcement cage by 40.32/9=4.48 t; therefore, the auxiliary crane selects 12 20t shackles to meet the requirement.

4. Checking calculation of hanging point

The hanging rib adopts 32mmQ235 (tensile strength 210N/mm) ² ) Round steel, which is most disadvantageous in that when the auxiliary crane is stressed most, the maximum stress is 40.32T of the weight of the steel reinforcement cage, and each lifting point bears 1/6 of the weight, namely 40.32/6=6.72T. The weakest stressed area of the round steel is a single sheared area; the maximum tensile strength is as follows:

N＝πR ² x 210=3.14×16×210 mpa=168.8 KN; i.e. the maximum sling weight is 16.88T;

the single-point crane weight is 6.72T <16.88T, and the lifting point steel bars, the main steel bars and the truss are welded together and bear force together, so that the lifting requirement is met.

The maximum weight borne by the hanging ring of the hanging bar is 48t when the reinforcement cage is vertical in the walking process of the crawler crane. Each reinforcement cage is provided with 8 lifting rings at the top, and each lifting ring bears 1/8 of the weight, namely 48/8=6t.

Hanging ring

Round steel, allowed tensile resistance of each steel bar:

N＝πR ² ×210＝3.14×16×16×210N＝16.88t；

then 6t <16.88t;

the strength of the hanging ring meets the requirement.

5. Hoisting process

Three steel wire ropes are stressed before the L-shaped reinforcement cage is lifted off the ground, and the L-shaped reinforcement cage is in the following state as shown in fig. 7;

the cage lifting process is also three rope stresses, as shown in fig. 11:

the four ropes are stressed after the reinforcement cage is erected and are consistent with the reinforcement cage in a straight line, as shown in figure 12.

The invention also provides a hoisting construction method of the special-shaped underground continuous wall reinforcement cage, which comprises the following steps:

step one, commanding the two cranes of the main crane and the auxiliary crane to be transferred to a hoisting position, and respectively installing shackles of hoisting points in a hoisting work;

step two, carefully checking the reinforcement cage before hoisting, and after checking the installation condition and the stress gravity center of the two crane steel wire ropes, starting to hoist horizontally at the same time without sundries except the reinforcement cage;

thirdly, performing test hanging, namely after the steel reinforcement cage is hung to be 200mm away from the ground, standing for 5 minutes, closely paying attention to whether a hanging point, the steel reinforcement cage and a reinforcing point are changed at the moment, immediately placing the steel reinforcement cage on the ground if potential safety hazards exist, re-reinforcing, lifting a hook after the steel reinforcement cage is inspected to be qualified, and commanding the auxiliary machine to be matched with the lifting hook at any time according to the distance between the tail part of the steel reinforcement cage and the ground;

step four: tilt lift

(1) The auxiliary crane keeps the position of the reinforcement cage 1m away from the ground unchanged; the main crane lifts, and simultaneously the main crane and the auxiliary crane rotate the large arm along with the direction of the reinforcement cage to enable the reinforcement cage to incline;

(2) the main crane hook continues to lift, and the auxiliary crane keeps a distance from the ground of 200-500mm until the reinforcement cage is vertically lifted;

step five, removing the auxiliary hanging pulley

After the steel reinforcement cage is in a vertical state, stopping for 3 minutes, after the steel reinforcement cage is completely stopped, commanding a crane to remove a steel wire rope on a shoulder pole of the auxiliary crane, and then keeping away from the hoisting operation range, wherein the distance between the bottom end of the steel reinforcement cage and the ground is not more than 0.5m in the crane walking process;

step six, commanding the main crane cage to enter the groove and positioning, wherein the crane is stable in running, and the traction rope is pulled on the reinforcement cage and cannot be forced to enter the groove when being lowered; in the running process, the speed of the steel bar cage is not more than 1km/h, at least 2 guide ropes are required to be arranged on the steel bar cage in the running process, and the guide ropes form an angle of 120 degrees with each other, so that the stability of the steel bar cage in the running process is ensured;

and step seven, measuring the height after the reinforcement cage is lowered in place, and ending the lowering process after meeting the requirements.

In another embodiment, before the step one, the method further comprises:

step a, carrying out test hanging on the reinforcement cage: hoisting the reinforcement cage away from the working platform, observing the deformation condition of the reinforcement cage when the steel wire rope is tightened and reaches a full-load stress state, and analyzing the feasibility of the next hoisting; when the steel reinforcement cage is lifted by 200mm, observing the deformation condition of the steel reinforcement cage, and if the steel reinforcement cage is seriously deformed and is not suitable for re-lifting, immediately stopping lifting; when the steel reinforcement cage is lifted by 0.2 m-0.5 m, the deformation condition of the steel reinforcement cage is observed again, the deformation condition of the steel reinforcement cage and the state of hoisting equipment are good, and the steel reinforcement cage can be operated in a descending way under a controllable state;

step b, analyzing the test hoisting result: if the deformation is too large in the lifting process of the reinforcement cage, researching the reinforcement cage together with a design unit and a supervision unit, reinforcing the integrity of the reinforcement cage, and modifying and optimizing a construction scheme; if the steel reinforcement cage is successfully lifted, various working conditions in the lifting process are analyzed and summarized to be used as follow-up construction guidance, and meanwhile, optimization suggestions are provided for a design unit.

Control measures in the hoisting process:

1. threading: and determining the gravity center of the suspended object, and selecting the position of the hanging rope. The rope is threaded by using an iron hook, so that the arm cannot be extended below the suspended object. The lifting of the corner is hard or easy to slide, and the lifting object must be lined with a gasket by a lasso.

2. Hanging rope: the ropes should be hung in sequence, and the hanging ropes must not be mutually extruded, crossed, twisted and twisted. The steel reinforcement cage is preferably in a rope method, and a clamping ring is used for locking the lifting rope.

3. And (3) test hoisting: the hanging rope is firmly hung, the crane slowly lifts, the hanging rope is tightly tightened and stopped slightly, the hanging rope cannot be too high, and in test hanging, a command signal worker, a hooking worker and a driver are in coordination. If the gravity center of the suspended object is found to be deviated or other objects are connected, etc.; the lifting must be stopped immediately, measures taken and safety back lifting confirmed.

4. Rope picking: the lifting rope can be loosened after rope falling, stopping and supporting. For hanging objects which are easy to roll, slide and scatter, a safety hook is used for rope picking.

5. Drawing rope: the lifting hook is vertical to the gravity center of the suspended object, and the rope is slowly lifted, so that the rope is not pulled obliquely or strongly, and the lifting arm is not rotated. If the lifting rope is pressed, the rope pulling should be stopped immediately, and the rope pulling method can be adopted for pulling the rope by adopting a lifting head test lifting method.

6. The distance between the crawler crane and the grooved edge during hoisting operation is required to be more than 2m, and the crawler crane is not required to be close to the soft road shoulder edge and the grooved wall edge so as to prevent lateral pressure on the grooved wall caused by back and forth walking. The crawler crane is required to be strictly stable during walking and turning, the phenomenon of pause is avoided, and the vibration of the machine is reduced as much as possible. Special attention must be paid to the prohibition of the operation, especially the stopping operation of the diesel engine, the lifting (dropping) of heavy, large and long objects and the high-altitude operation. Ensuring the safety and the quality of the formed groove.

7. The hanging operation should comply with the following regulations:

(1) The operation should be slow-lifting, slow-rotating and slow-moving, and the control rope is used for keeping the suspended object stable.

(2) The clamp should be avoided being collided in the hoist and mount when hanging. When the carrying pole is hung, the hanging point is symmetrical to the center of the hung object.

(3) When the operation is suspended, the components are required to be supported stably, and the components can leave the site after being firmly connected.

(4) When the clamping ring is used, the lateral stress of the clamping ring is strictly forbidden, and whether the sealing pin is screwed up or not is checked before hoisting. A cracked, deformed snap ring must not be used. And (5) repairing the clamping ring by a welding repair method.

(5) Before using the newly purchased sling, the qualification certificate of the sling should be checked, and the sling should be tried to be hung, so as to confirm the safety.

Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

Claims (6)

1. The special-shaped underground continuous wall reinforcement cage is characterized in that the special-shaped underground continuous wall reinforcement cage is a reinforcement cage with a Z-shaped horizontal section, the Z-shaped reinforcement cage is formed by splicing two reinforcement cages with L-shaped horizontal sections, and the L-shaped reinforcement cage comprises a vertical main rib and a horizontal rib surrounding the main rib;

the inner part of the L-shaped steel reinforcement cage is reinforced by welding X-shaped truss ribs, and the outer side surface of the L-shaped steel reinforcement cage is reinforced by welding scissors ribs; a sound detection pipe and a grouting pipe are also arranged in the L-shaped reinforcement cage; the L-shaped steel reinforcement cage is embedded with a steel plate at the position of a structural reverse plate, the outer wall of the steel plate is welded with straight ribs, the outer side surfaces of the L-shaped steel reinforcement cage, which are positioned at two sides of the steel plate, are welded with L-shaped beard ribs, and the L-shaped steel reinforcement cage is embedded with a straight thread connector at the position of a bottom plate; pre-buried bars for connecting with the crown beam are reserved at the top of the L-shaped reinforcement cage; diagonal bracing ribs for enhancing the rigidity of the horizontal section of the reinforcement cage are arranged at the inner corners of the L-shaped reinforcement cage; and a hanging ring is arranged at a pre-calculated hanging point position on the L-shaped steel reinforcement cage.

2. The special-shaped underground diaphragm wall reinforcement cage according to claim 1, wherein two main ribs coaxial on the same warp at the junction of the L-shaped reinforcement cage and the plain concrete section are connected by welding, and two main ribs coaxial on the same warp at other positions of the L-shaped reinforcement cage are connected by adopting a straight thread sleeve; the main reinforcement and the stirrup are welded and connected, and the number of the cross spot welds is not less than 50% of the total number of the crossing points of the main reinforcement and the stirrup.

3. The special-shaped underground diaphragm wall reinforcement cage of claim 1, wherein the grouting pipe is a steel pipe with the outer diameter of 32mm, the wall thickness of 3.5mm and the material Q235B, and the steel pipe is lifted to the ground;

each wall of the sound measuring tube is provided with 5 sound measuring tubes which are arranged according to a W shape, the outer diameter of the sound measuring tube is 50mm, the wall thickness is 1.5mm, a screw thread joint is adopted at the joint, the wall thickness at the joint is 3mm, and the distance between two adjacent sound measuring tubes is not more than 1.5m.

4. The special-shaped underground diaphragm wall reinforcement cage according to claim 1, wherein the steel plates are 1000 x 1400 x 16mm in size, the distance between two adjacent steel plates is 3m, 25 phi 18 straight ribs are uniformly distributed on the outer wall of each steel plate, each side of each beard rib is 35d, and the model of each beard rib is phi 16@450 x 450.

5. The hoisting construction method of the special-shaped underground diaphragm wall reinforcement cage according to any one of claims 1 to 4, comprising the steps of:

step one, commanding the two cranes of the main crane and the auxiliary crane to be transferred to a hoisting position, and respectively installing shackles of hoisting points in a hoisting work;

step two, carefully checking the reinforcement cage before hoisting, and after checking the installation condition and the stress gravity center of the two crane steel wire ropes, starting to hoist horizontally at the same time without sundries except the reinforcement cage;

thirdly, performing test hanging, namely after the steel reinforcement cage is hung to be 200mm away from the ground, standing for 5 minutes, closely paying attention to whether a hanging point, the steel reinforcement cage and a reinforcing point are changed at the moment, immediately placing the steel reinforcement cage on the ground if potential safety hazards exist, re-reinforcing, lifting a hook after the steel reinforcement cage is inspected to be qualified, and commanding the auxiliary machine to be matched with the lifting hook at any time according to the distance between the tail part of the steel reinforcement cage and the ground;

step four: tilt lift

(1) The auxiliary crane keeps the position of the reinforcement cage 1m away from the ground unchanged; the main crane lifts, and simultaneously the main crane and the auxiliary crane rotate the large arm along with the direction of the reinforcement cage to enable the reinforcement cage to incline;

(2) the main crane hook continues to lift, and the auxiliary crane keeps a distance from the ground of 200-500mm until the reinforcement cage is vertically lifted;

step five, removing the auxiliary hanging pulley

After the steel reinforcement cage is in a vertical state, stopping for 3 minutes, after the steel reinforcement cage is completely stopped, commanding a crane to remove a steel wire rope on a shoulder pole of the auxiliary crane, and then keeping away from the hoisting operation range, wherein the distance between the bottom end of the steel reinforcement cage and the ground is not more than 0.5m in the crane walking process;

step six, commanding the main crane cage to enter the groove and positioning, wherein the crane is stable in running, and the traction rope is pulled on the reinforcement cage and cannot be forced to enter the groove when being lowered; in the running process, the speed of the steel bar cage is not more than 1km/h, at least 2 guide ropes are required to be arranged on the steel bar cage in the running process, and the guide ropes form an angle of 120 degrees with each other, so that the stability of the steel bar cage in the running process is ensured;

and step seven, measuring the height after the reinforcement cage is lowered in place, and ending the lowering process after meeting the requirements.

6. The method for hoisting construction of a profiled underground diaphragm wall reinforcement cage according to claim 5, further comprising, before step one:

step a, carrying out test hanging on the reinforcement cage: hoisting the reinforcement cage away from the working platform, observing the deformation condition of the reinforcement cage when the steel wire rope is tightened and reaches a full-load stress state, and analyzing the feasibility of the next hoisting; when the steel reinforcement cage is lifted by 200mm, observing the deformation condition of the steel reinforcement cage, and if the steel reinforcement cage is seriously deformed and is not suitable for re-lifting, immediately stopping lifting; when the steel reinforcement cage is lifted by 0.2 m-0.5 m, the deformation condition of the steel reinforcement cage is observed again, the deformation condition of the steel reinforcement cage and the state of hoisting equipment are good, and the steel reinforcement cage can be operated in a descending way under a controllable state;

step b, analyzing the test hoisting result: if the deformation is too large in the lifting process of the reinforcement cage, researching the reinforcement cage together with a design unit and a supervision unit, reinforcing the integrity of the reinforcement cage, and modifying and optimizing a construction scheme; if the steel reinforcement cage is successfully lifted, various working conditions in the lifting process are analyzed and summarized to be used as follow-up construction guidance, and meanwhile, optimization suggestions are provided for a design unit.

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