CN115467364A - Construction method of 0# block diaphragm beam tower crane foundation - Google Patents

Abstract

The invention relates to the technical field of constructional engineering, in particular to a construction method of a 0# block diaphragm beam tower crane foundation; the method comprises the following steps: step 1, erecting square foundation bottom ribs on the ground; step 2, foundation bolts are installed in the foundation bottom ribs; step 3, carrying out 0# block concrete pouring on the foundation bottom bar; step 4, mounting a base plate and a fixed foundation section on the foundation bolt after pouring forming; step 5, installing tower crane grounding connection on the fixed base section; according to the construction method, the suspension casting beam 0# block is used as the tower crane foundation, an independent foundation does not need to be constructed, the installation is completed once, climbing is not needed in the later period, a wall-attached rod piece does not need to be arranged, the height of the main mast of the tower crane is reduced, the construction safety is high, and the applicability is strong; meanwhile, the construction method has high installation efficiency, saves the construction period, reduces the treatment cost of the tower crane foundation and reduces the environmental pollution.

Description

Construction method of 0# block diaphragm beam tower crane foundation

Technical Field

The invention relates to the technical field of constructional engineering, in particular to a construction method of a 0# block diaphragm beam tower crane foundation.

Background

The tower crane is used as a vertical and horizontal transportation tool, the work efficiency can be greatly improved, and the common tower crane foundation form is as follows: natural foundation soil foundations, pile cap foundations, combined foundations and the like; the tower crane foundation needs to be constructed before the tower crane is installed, and the tower crane foundation is used as an important component of the tower crane and bears the working load, the self weight and the anti-overturning effect of the tower crane; in addition, the conventional method can be independently used as a tower crane foundation, different tower crane foundation forms have different construction difficulties, and consumed labor, materials and machines are also greatly different; the site selection of the tower crane foundation is generally greatly influenced by geological conditions and sites, the limitation of sites crossing rivers, valleys, existing lines and the like is a problem which is often met by the site selection of the tower crane foundation, the site selection geological condition is complex, the bearing capacity cannot meet the requirements in a tower crane specification, and a large amount of labor, materials and machines are consumed in the foundation treatment when the foundation is applied.

The bridge is arranged to span multiple places such as rivers, lakes, existing lines, valleys and the like, and the terrain and geological conditions are complex. A tower crane is mostly adopted as a vertical transportation tool in bridge construction, and the selection of the position of the tower crane and the foundation treatment are very important. Under the general condition, bridge construction tower crane basis is mostly independent foundation, attaches the wall through the tower crane and links to each other with the pier stud, and this kind of technology leads to the tower crane main mast highly too high, has certain potential safety hazard.

Disclosure of Invention

The invention aims to provide a 0# block diaphragm beam tower crane foundation construction device and a method, which mainly solve the technical problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

a construction method of a 0# block diaphragm beam tower crane foundation comprises the following steps:

step 1, erecting square foundation bottom ribs on the ground;

step 2, foundation bolts are installed in the foundation bottom ribs;

step 3, casting No. 0 concrete on the foundation bottom bar;

step 4, mounting a base plate and a fixed base section on the foundation bolt after pouring forming;

and 5, installing tower crane grounding connection on the fixed base section.

Preferably, step 1 specifically includes, subaerial along the horizontal direction equidistance laid multiunit one-level pressure-bearing reinforcing bar, multiunit main muscle A fixed connection through the mutual parallel arrangement of multiunit between the one-level pressure-bearing reinforcing bar, main muscle A with the intersection of one-level pressure-bearing reinforcing bar is along the equal fixedly connected with of vertical direction frame muscle, multiunit the other end fixedly connected with multiunit second grade pressure-bearing reinforcing bar and the main muscle B of frame muscle, multiunit second grade pressure-bearing reinforcing bar and main muscle B and multiunit one-level pressure-bearing reinforcing bar and main muscle A are in the frame muscle symmetrical arrangement about forming the end muscle of square basis for pour the pier position and install the tower crane.

Preferably, the step 2 specifically includes bundling foundation bottom bars to form a reinforcing mesh, fixedly mounting 16 foundation bolts on a positioning frame through nuts, then integrally hoisting the assembled foundation bolts and the positioning frame into the foundation bottom bars, placing the positioning frame at the top end of the reinforcing mesh, and extending the bottom ends of the foundation bolts into the reinforcing mesh and fixedly connecting round steel;

the bottom of rag bolt is provided with the portion of bending, just the round steel passes through the portion fixed mounting of bending be in rag bolt's bottom.

Preferably, the step 3 specifically includes that four groups of prestressed corrugated pipes are fixedly installed in the steel bar net along the vertical direction on two opposite sides of the positioning frame, then concrete is adopted to cast and form the foundation bottom bars, and the foundation bottom bars are used for forming four groups of preformed holes after casting to install the grounding rods;

the concrete label is a 0# block concrete label, and a concrete solid section is formed at the center of the 0# block of the tower crane foundation.

Preferably, the step 4 specifically includes, after the concrete is poured, shaped and received, removing the positioning frame, sequentially installing a base plate and a fixed base section on the outer surfaces of the four anchor bolts at adjacent positions from bottom to top, wherein each of the outer surfaces of the anchor bolts is located, and nuts are screwed on the opposite surfaces of the base plate and the fixed base section, and are used for fixedly installing the base plate and the fixed base section on the anchor bolts, and the nuts at the bottommost layer are installed on the top end of the concrete.

Preferably, the step 5 specifically includes that the outer surface of the fixed base section is fixedly connected with a grounding wire, the other end of the grounding wire is fixedly connected with a grounding rod through a fastener, and the grounding rod is inserted into the ground for 1.5 meters or less along the inner wall of the preformed hole.

Preferably, the lower concrete filling rate of the base plate at the top end of the base bottom rib is greater than 95%, and the base plate is allowed to be embedded into concrete by 5-6mm.

Preferably, the fixed base joint and the backing plate are provided with gaskets therebetween, the area of each gasket is larger than 90% of the area of the backing plate, and the number of the gaskets arranged below the backing plate is not more than two.

Preferably, the fixed base section is used for mounting a tower body section, the tower body section comprises a main chord member, the main chord member is fixedly mounted at the top end of the fixed base section along the vertical direction, three connecting sleeves are arranged at the upper end of the main chord member, and a flange plate is arranged at the lower end of the main chord member and used for connecting the adjacent main chord member and the inclined web member;

high-strength bolts are adopted between the main chord member and the diagonal web members, and each high-strength bolt is assembled with two washers and two nuts and is tightened to prevent looseness;

the main chord adopts theodolite or suspension wire method inspection straightness that hangs down, main chord four sides straightness error that hangs down is all not more than 1/500.

Compared with the prior art, the invention has the beneficial effects that:

according to the method, pre-buried and reserved holes for mounting and anchoring the tower crane are reserved in the process of mounting the top plate steel bars of the solid section of the 0# block transverse partition beam, after the prestressed corrugated pipe is mounted and fixed, four groups of foundation bolts (16) of the tower crane are positioned and pre-buried, the foundation bolts are connected with foundation bottom ribs, then a tower crane grounding rod is inserted below the ground, and finally the tower crane is mounted; according to the construction method, the suspension casting beam 0# block is used as a tower crane foundation, an independent foundation does not need to be constructed, the suspension casting beam is installed in place once, climbing is not needed in the later period, a wall-attached rod piece does not need to be arranged, the height of a main mast of the tower crane is reduced, the construction safety is high, and the applicability is strong; meanwhile, the construction method has high installation efficiency, saves the construction period, reduces the treatment cost of the tower crane foundation and reduces the environmental pollution.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of a frame of a No. 0 transverse partition beam tower crane of the invention after pouring foundation reinforcement;

FIG. 2 is a partial cross-sectional view of FIG. 1 in the position of assembling an anchor bolt and a retaining frame and placing a casting in accordance with the present invention;

FIG. 3 is a partial cross-sectional view of the invention shown in FIG. 2 after casting with a fixed base section installed;

FIG. 4 is a top view of FIG. 3 of the present invention;

FIG. 5 is a schematic illustration of the structure of FIG. 3 in the installed tower section of the present invention;

FIG. 6 is a schematic structural diagram of positions where multiple groups of tower cranes are to be installed in the invention;

FIG. 7 is a schematic view of a truck crane station 1 for installing a tower crane according to the present invention;

FIG. 8 is a schematic view of a truck crane station 2 when a tower crane is installed in the present invention;

FIG. 9 is a schematic view of a truck crane station 3 when a tower crane is installed in the present invention;

FIG. 10 is a schematic structural diagram of the tower crane after installation is completed.

In the figure: the foundation comprises a foundation bottom rib 1, a primary pressure-bearing steel bar 101, a main rib A102, a erection rib 103, a secondary pressure-bearing steel bar 104, a main rib B105, a grounding wire 2, a grounding rod 3, round steel 4, a nut 5, an anchor bolt 6, a bent part 61, concrete 7, a base plate 8, a fixed foundation section 9, a positioning frame 10, a preformed hole 11, a pier position 12, a tower crane 13 and a tower section 14.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.

As shown in FIGS. 1-4, the invention provides a construction method of a 0# block diaphragm beam tower crane foundation, which comprises the following steps: step 1, erecting square foundation bottom ribs on the ground; step 2, installing foundation bolts in the foundation bottom ribs; step 3, carrying out 0# block concrete pouring on the foundation bottom bar; step 4, mounting a base plate and a fixed foundation section on the foundation bolt after pouring forming; and 5, installing tower crane grounding connection on the fixed base section.

According to the method, pre-buried and reserved embedded parts and pre-reserved holes 11 are used for mounting and anchoring a tower crane 13 in the process of mounting the top plate steel bars of the solid section of the 0# block diaphragm beam, after the prestressed corrugated pipe is fixedly mounted, four groups of foundation bolts 6 (16) of the tower crane 13 are positioned and pre-buried, the foundation bolts 6 are connected with foundation bottom ribs 1, then a tower crane 13 grounding rod 3 is inserted into the ground, and finally the tower crane is mounted; according to the construction method, the suspension casting beam 0# block is used as the tower crane 13 foundation, an independent foundation does not need to be constructed, the installation is completed once, climbing is not needed in the later period, a wall-attached rod does not need to be arranged, the height of a main mast of the tower crane 13 is reduced, the construction safety is high, and the applicability is strong; meanwhile, the construction method has high installation efficiency, saves the construction period, reduces the treatment cost of the foundation of the tower crane 13 and reduces the environmental pollution.

Specifically, in step 1, subaerial along the horizontal direction equidistance laid multiunit one-level pressure-bearing reinforcing bar 101, main muscle A102 fixed connection through the mutual parallel arrangement of multiunit between the multiunit one-level pressure-bearing reinforcing bar 101, main muscle A102 and the equal fixedly connected with of perpendicular direction frame muscle 103 of cross section edge of one-level pressure-bearing reinforcing bar 101, multiunit frame muscle 103's other end fixedly connected with multiunit second grade pressure-bearing reinforcing bar 104 and main muscle B105, multiunit second grade pressure-bearing reinforcing bar 104 and main muscle B105 and multiunit one-level pressure-bearing reinforcing bar 101 and main muscle A102 are about frame muscle 103 symmetrical arrangement, form at the bottom of the square basis muscle 1, be used for pouring tower crane pier position 12 and installation 13.

Specifically, in step 2, tie up basic end muscle 1 and form the reinforcing bar net, pass through nut 5 fixed mounting 16 rag bolts 6 on posting frame 10, then with the whole foundation bolt 6 that will assemble and posting frame 10 hang into in the basic end muscle 1, and posting frame 10 arranges the top of reinforcing bar net in, rag bolt 6's bottom extends to in the reinforcing bar net and fixedly connected with round steel 4, rag bolt 6's bottom is provided with the portion of bending 61, and round steel 4 is through the bottom of the portion of bending 61 fixed mounting at rag bolt 6, and the diagonal error of the pre-buried bolt hole after the equipment is not more than 2mm.

Specifically, in the step 3, four groups of prestressed corrugated pipes are fixedly installed in the reinforcing steel bar net along the vertical direction at two opposite sides of the positioning frame 10, then the foundation bottom bar 1 is cast and molded by adopting concrete 7, and four groups of preformed holes 11 are formed after casting for installing the grounding rods 3; the concrete 7 is the No. 0 block concrete 7, and the central position of the No. 0 block of the foundation of the tower crane 13 forms a concrete 7 solid section.

Specifically, in step 4, after the concrete 7 is poured, formed and received, the positioning frame 10 is removed, a base plate 8 and a fixed base section 9 are sequentially installed on the outer surfaces of the four foundation bolts 6 located at adjacent positions from bottom to top, nuts 5 are screwed on the outer surfaces of each foundation bolt 6 and the back surfaces of the base plate 8 and the fixed base section 9, the nuts 5 are used for fixedly installing the base plate 8 and the fixed base section 9 on the foundation bolts 6, and the nuts 5 located at the bottommost layer are installed on the top end of the concrete 7.

Specifically, in step 5, the outer surface of the fixed base joint 9 is fixedly connected with a ground wire 2 (the ground wire 2 is an insulated copper cable with a cross section not smaller than 16 mm), the other end of the ground wire 2 is fixedly connected with a ground rod 3 through a fastener, and the ground rod 3 is inserted into the ground for 1.5 meters or less along the inner wall of the preformed hole 11.

The filling rate of the lower concrete of the base plate 8 at the top end of the foundation bottom rib 1 is more than 95%, and the base plate 8 is allowed to be embedded into the concrete by 5-6mm.

Wherein, a gasket is arranged between the fixed base joint 9 and the backing plate 8, the area of the gasket is more than 90 percent of the area of the backing plate 8, the quantity of the gaskets arranged below each backing plate 8 is not more than two, the levelness of the fixed base joint 9 after installation is ensured to be less than 1/750, and the error between the central line and the horizontal verticality is 1.5/1000.

Specifically, referring to fig. 5, the fixed base section 9 is used for mounting a tower body section 14, the tower body section 14 includes a main chord member, the main chord member is fixedly mounted on the top end of the fixed base section 9 along the vertical direction, three connecting sleeves are arranged at the upper end of the main chord member, and a flange plate is arranged at the lower end of the main chord member and used for connecting the adjacent main chord member and the diagonal web member;

high-strength bolts are adopted between the main chord member and the diagonal web members, and each high-strength bolt is assembled with two washers and two nuts 5 and is tightened to prevent looseness;

the verticality of the main chord is checked by adopting a theodolite or a suspension wire method, and the verticality errors of the four side surfaces of the main chord are not more than 1/500.

In this embodiment, before operation step 1, the tower crane 13 needs to be installed as follows;

1) In order to meet the installation and normal use of the tower crane, a special distribution box meeting the safety requirement is arranged, and the distance between the special distribution box and the center of the tower crane is not more than 3m;

2) Cleaning a road for a transport vehicle to enter and exit, cleaning and compacting a field within 20m of the periphery of the foundation of the tower crane, so as to facilitate the placement of components of the tower crane entering the field and the ground assembly of the components;

3) The used truck crane is comprehensively checked, and particularly, the safety device, the steel wire rope and each moving part ensure the safe use in the installation process;

4) Technicians must carry out field survey in advance, problems possibly existing in the process of tower crane installation and later-stage disassembly are fully considered, and feasible measures are made;

5) Maintenance and inspection of the tower crane are well carried out, installation parts are cleaned, and shipping preparation is well carried out;

6) Completing three-level safety education before tower crane installation operators enter the field, and forming records;

7) Before the tower crane is installed, a technician organizes operating personnel to complete safe and technical bottom-crossing work;

8) When the tower crane is installed, the on-site responsible person, the full-time safety worker, the supervision engineer and other related personnel at the project department need to be supervised by the on-site side station, so that the tower crane can be ensured to operate safely and smoothly.

In this embodiment, referring to fig. 6, when other tower cranes 13 need to be arranged within the working range of the tower crane 13, in order to ensure that the tower cranes do not collide with each other during operation, 4 standard knots should be staggered from each tower crane 13 at each pier position 12, and the standard knots are set to be 1.5x1.5x2.2 meters in size, so as to ensure the construction safety.

In the embodiment, in the operation step 3, three groups of concrete 7 test pieces of the standard curing test block and the same curing test block are reserved for strength pressure testing when the foundation concrete 7 is poured; when the strength of the concrete 7 reaches more than 80%, the tower body can be allowed to be installed; after the strength reaches 100%, the steel can be put into use after being qualified through inspection; the pouring quality requirements of the concrete 7 are as follows:

in this embodiment, referring to fig. 7 to 9, after the operation of step 5 is completed, the following preparations before the car is hoisted are made:

1) The site of the automobile crane station is required to be flat and hardened, other sundries cannot be stacked, and an alarm line is arranged outside the lifting range of the crane arm; 1000 × 35mm steel plates are arranged below the four supporting legs when the truck crane is used for hoisting, and the uniform load bearing is ensured; the on-site requirement is that the passage is larger than 6 meters.

2) According to the relation between the weight and the height of a truck crane hoisting unit, different working amplitudes and arm lengths and different hoisting heights and hoisting capacities are determined, the station position of the truck crane is determined, and the safe hoisting of the tower crane 13 assembly is ensured (a proper steel wire rope is selected according to regulations and standards).

In this embodiment, the tower crane 13 is installed in the following order:

1) A tower body section 14 is arranged on the fixed base section 9;

2) A climbing frame is arranged on the tower body section 14;

3) Installing a rotation assembly and a cab on the climbing frame;

4) Installing a tower top at the top end of the rotary assembly;

5) A balance arm assembly is arranged on one side of the rotation assembly, which is far away from the cab;

6) A balance arm pull rod is arranged between the balance arm assembly and the tower top;

7) A first 3.3-ton balancing weight is arranged at the bottom of one end of the balancing arm assembly, which is far away from the cab;

8) A cargo boom assembly is arranged at one end of the rotation assembly close to the cab;

9) A boom pull rod is arranged between the boom assembly and the tower top;

10 The remaining counterweights are mounted at the bottom end of the balance arm assembly.

In this embodiment, as shown in fig. 10, after the tower crane 13 is completely installed, the tower crane is connected to a test operation for ensuring personal safety of operators during the use of the subsequent tower crane 13.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. A construction method of a 0# block diaphragm beam tower crane foundation is characterized by comprising the following steps: the method comprises the following steps:

step 1, erecting square foundation bottom ribs on the ground;

step 2, foundation bolts are installed in the foundation bottom ribs;

step 3, carrying out 0# block concrete pouring on the foundation bottom bar;

step 4, mounting a base plate and a fixed base section on the foundation bolt after pouring forming;

and 5, installing tower crane grounding connection on the fixed base section.

2. The construction method of the 0# block diaphragm beam tower crane foundation according to claim 1, characterized in that: the step 1 specifically comprises: subaerial along the horizontal direction equidistance laid multiunit one-level pressure-bearing reinforcing bar, the multiunit main muscle A fixed connection through the mutual parallel arrangement of multiunit between the one-level pressure-bearing reinforcing bar, main muscle A with the equal fixedly connected with of vertical direction frame muscle, multiunit are followed to the cross section of one-level pressure-bearing reinforcing bar the other end fixedly connected with multiunit second grade pressure-bearing reinforcing bar and the main muscle B of frame muscle, multiunit second grade pressure-bearing reinforcing bar and main muscle B and multiunit one-level pressure-bearing reinforcing bar and main muscle A are in the frame muscle symmetrical arrangement of being concerned with, form the muscle at the bottom of the square foundation for pour the pier position and install the tower crane.

3. The construction method of the 0# block transverse partition beam tower crane foundation according to claim 2, characterized in that: the step 2 specifically comprises the steps of binding foundation bottom bars to form a reinforcing mesh, fixedly mounting 16 foundation bolts on a positioning frame through nuts, integrally hoisting the assembled foundation bolts and the positioning frame into the foundation bottom bars, arranging the positioning frame at the top end of the reinforcing mesh, and extending the bottom ends of the foundation bolts into the reinforcing mesh and fixedly connecting round steel;

the bottom of rag bolt is provided with the portion of bending, just the round steel passes through the portion fixed mounting of bending be in rag bolt's bottom.

4. The construction method of the 0# block diaphragm beam tower crane foundation according to claim 3, characterized in that: step 3 specifically comprises fixedly mounting four groups of prestressed corrugated pipes into the steel bar net along the vertical direction at two opposite sides of the positioning frame, then pouring and molding foundation bottom reinforcements by adopting concrete, and forming four groups of preformed holes for mounting the grounding rods after pouring;

the concrete label is 0# block concrete label, and the center of the 0# block of the tower crane foundation is positioned to form a concrete solid section.

5. The construction method of the 0# block transverse partition beam tower crane foundation according to claim 4, characterized in that: step 4 specifically includes, waiting concrete placement shaping to receive the material after, demolish the locating frame, all install backing plate and fixed base section from bottom to top in proper order at four rag bolts's that are in adjacent position surface, every rag bolt's surface just is located backing plate and fixed base section's the equal spiro union in back of the body have the nut, the nut be used for with backing plate and fixed base section fixed mounting be in on the rag bolt, and be in the bottom the nut is installed the top of concrete.

6. The construction method of the 0# block diaphragm beam tower crane foundation according to claim 5, characterized in that: the step 5 specifically includes that the outer surface of the fixed base section is fixedly connected with a grounding wire, the other end of the grounding wire is fixedly connected with a grounding rod through a fastener, and the grounding rod is inserted into the ground for 1.5 meters or less along the inner wall of the preformed hole.

7. The construction method of the 0# block diaphragm beam tower crane foundation according to claim 5, characterized in that: the filling rate of the lower concrete of the base plate at the top end of the foundation bottom rib is more than 95%, and the base plate is allowed to be embedded into the concrete by 5-6mm.

8. The construction method of the 0# block transverse partition beam tower crane foundation according to claim 7, characterized in that: the fixed base section with be provided with the gasket between the backing plate, the gasket area is greater than 90% of backing plate area, and every the gasket quantity that sets up below the backing plate is no longer than two.

9. The construction method of the 0# block diaphragm beam tower crane foundation according to claim 8, characterized in that: the tower body section comprises main chords, the main chords are fixedly installed at the top end of the fixed base section along the vertical direction, three connecting sleeves are arranged at the upper ends of the main chords, and a flange plate is arranged at the lower ends of the main chords and used for connecting the adjacent main chords and the inclined web members;

high-strength bolts are adopted between the main chord member and the diagonal web members, and each high-strength bolt is assembled with two washers and two nuts and is tightened to prevent looseness;

the main chord adopts theodolite or suspension wire method inspection straightness that hangs down, main chord four sides straightness error that hangs down is all not more than 1/500.

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