CN112575793A - Open cut foundation pit continuous beam capable of being rapidly installed with steel support - Google Patents

Abstract

The invention discloses an open cut foundation pit continuous beam capable of being rapidly installed with a steel support. The invention has the beneficial effects that: the connecting beam is blanked in advance, the connecting beam material which is blanked is directly installed at the corresponding position when earth is excavated to the elevation, and electric welders are arranged at two ends of the connecting beam to work simultaneously, so that the construction time is greatly shortened. Through control of the underground embedded plate of the diaphragm wall, model selection of the gantry crane and steel support section division, the installation time of the steel support is shortened, the steel support is ensured to be vertical to the embedded plate, and the workload exerted by the axial force of the steel support is reduced. Through the measures, the installation time of the connecting beam and the steel support is greatly reduced, the blanking and assembling time is completely advanced, the stability and the rapidness in construction are ensured, and the construction speed is greatly improved.

Description

Open cut foundation pit continuous beam capable of being rapidly installed with steel support

Technical Field

The invention relates to a continuous beam, in particular to an open cut foundation pit continuous beam capable of being rapidly installed with a steel support, and belongs to the technical field of building construction.

Background

Along with the rapid development of the subway industry at present, the large-span open cut foundation pits are more and more, steel supports and connecting beams are commonly arranged in the open cut foundation pits, the field construction standard is gradually increased, the construction cost of engineering units is not increased, and the maximum profit of enterprises/projects is ensured. Therefore, measures must be taken from multiple aspects in the construction field, the welding of the steel support and the connecting beam is accelerated, the capital expenditure is reduced, and the income is increased.

The connecting construction installation efficiency of the existing connecting beam and the steel support is low, and the steel support and the connecting beam cannot be guaranteed to be positioned on the same horizontal line.

Disclosure of Invention

The invention aims to solve the problems and provide the open cut foundation pit continuous beam capable of being quickly installed with the steel support.

The invention realizes the purpose through the following technical scheme: an open cut foundation pit continuous beam capable of being rapidly installed with a steel support comprises a ground coupling wall, a continuous beam, a pre-embedded steel plate, fastening bolts, supporting steel plates, expansion bolts, a crown beam, an installation seat, the steel support, a stand column pile, a lattice column, profile steel, a connecting steel plate, a steel reinforcement cage, a main reinforcement and a connecting reinforcement; the ground is wall, continuous beam and steel support constitute the major structure of the device, the inside of ground is wall is provided with lattice post and steel reinforcement cage, the lattice post comprises four shaped steel, four shaped steel are rectangle setting, then weld four shaped steel through connecting steel plate, the lower extreme fixed mounting of lattice post has the stand stake, the inboard fixed reinforcement cage that is provided with of lattice post, the steel reinforcement cage includes main muscle and connecting rib, every main muscle is all together welded through connecting rib, the outside fixed welding of lattice post has pre-buried steel plate, be provided with the screw hole on the pre-buried steel plate, and threaded hole fit connection has fastening bolt, pre-buried steel plate has continuous beam through fastening bolt fixed connection, the inboard fixed welding of continuous beam has hat beam, hat beam keeps away from one side fixed connection mount pad of continuous beam, one side rigid coupling that the crown beam was kept away from to the mount pad has the steel shotcrete, the downside of continuous beam still runs through and installs supporting steel plate, the upper and lower both sides of supporting steel plate all carry out the rigid coupling through expansion bolts and continuous beam.

The connection of the steel support and the continuous beam comprises the following steps:

preparing before construction, wherein before the rotary drilling rig is constructed, a measuring team measures a rotary drilling rod to ensure that the verticality of the rod is not more than 1/150 and a steel reinforcement cage is manufactured;

step two, mounting lattice columns, connecting the square lattice columns with temporary upright column piles, and simultaneously lowering the upright column piles and the lattice columns to ensure that the directions of the lattice columns are consistent and the lattice columns are vertical, so that the spacing between the lattice columns is the same as that of a drawing;

step three, constructing the underground embedded plate of the diaphragm wall;

step four, determining a suspension device, wherein the station is a deep foundation pit large-span foundation pit, the middle of the station is provided with a connecting beam, the whole steel support cannot be smoothly installed and removed, and the length and the weight of the phi 800X 16mm steel support is 28m and about 10t, so that a double-hook 10+10t15t single-leg cantilever gantry crane is selected to ensure the construction safety;

step five, assembling the steel supports in sections; the total length of the steel support is about 28m, and the steel support needs to be hoisted in two sections according to design requirements.

Preferably, for the convenience of making connect from top to bottom on same facade, guarantee holistic straightness that hangs down, steel reinforcement cage and lattice column transfer in-process need middle welding twice, weld at every turn and strictly measure according to the data, guarantee that every limit of lattice column is 30cm apart from the steel reinforcement cage outside to the squareness of level bar measurement junction.

Preferably, in order to ensure the direction of the lattice column and prevent the lattice column from inclining, the top end of the lattice column is welded with a 'cross-shaped lattice' reinforcing steel bar, and the length of the reinforcing steel bar is 1-2cm away from the pile casing.

Preferably, in order to facilitate the in time adjustment pre-buried steel sheet offset distance according to the wall groove section deviation condition even in ground, prevent because the groove section slope, lead to the steel reinforcement cage deviation to arouse pre-buried steel sheet skew, lead to steel shotcrete and pre-buried steel sheet out of plumb, arouse to have the gap between stiff end and the pre-buried steel sheet, even set up the groove section in the wall even in ground, and after the groove section excavation was accomplished, through the ultrasonic detector inspection groove section deviation condition.

Preferably, in order to ensure that the steel support is installed quickly, the steel support needs to be hoisted into two sections, the steel support is spliced into two sections on the ground, one section of the movable end is about 15m, the length of the fixed end side is about 13m, the long section of the steel support is placed on the connecting beam, and then the short section is hoisted to the corresponding position of the long section.

The invention has the beneficial effects that: the open cut foundation pit continuous beam capable of being rapidly installed with the steel support is reasonable in design, the steel reinforcement cage and the lattice column need to be welded twice in the middle in the lowering process, each welding is strictly measured according to data, each side of the lattice column is ensured to be 30cm away from the outer side of the steel reinforcement cage, the verticality of the connection part is measured by a horizontal ruler, the upper part and the lower part are conveniently connected on the same vertical surface, the whole verticality is ensured, the top end of the lattice column is welded with a 'cross-shaped lattice' steel reinforcement, the length of the steel reinforcement is 1-2cm away from a protective cylinder, the direction of the lattice column is conveniently ensured, the lattice column is prevented from inclining, a groove section is arranged in the underground diaphragm wall, after the groove section is excavated, the deviation condition of the groove section is checked by an ultrasonic detector, the deviation of the embedded steel plate is conveniently adjusted in time according to the deviation condition of the groove section of the underground diaphragm wall, the deviation of, cause to have the gap between stiff end and the pre-buried steel sheet, the steel shotcrete need fall into two sections hoists, and subaerial first splices the steel shotcrete into two sections, and loose end one section is about 15m, and the distolateral length of fixed end is about 13m, places the long section of steel shotcrete on the tie beam earlier, and the nipple joint hoist is as for the long section corresponding position again, is convenient for guarantee that the steel shotcrete is installed fast.

Drawings

FIG. 1 is a schematic view of the connection structure of the connection beam and the steel support according to the present invention;

FIG. 2 is a schematic view of the connection structure of the connection beam and the diaphragm wall according to the present invention;

FIG. 3 is a schematic view of a lattice column structure of the present invention;

fig. 4 is a schematic structural view of the reinforcement cage of the present invention.

In the figure: 1. the steel column comprises a ground connection wall, 2, a continuous beam, 3, an embedded steel plate, 4, fastening bolts, 5, a supporting steel plate, 6, expansion bolts, 7, a crown beam, 8, a mounting seat, 9, a steel support, 10, a column pile, 11, a lattice column, 12, section steel, 13, a connecting steel plate, 14, a reinforcement cage, 15, main ribs, 16 and connecting ribs.

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.

Referring to fig. 1 to 4, the open cut foundation pit continuous beam capable of being rapidly installed with a steel support comprises a ground diaphragm wall 1, a continuous beam 2, a pre-embedded steel plate 3, a fastening bolt 4, a supporting steel plate 5, an expansion bolt 6, a crown beam 7, an installation seat 8, a steel support 9, a vertical column pile 10, a lattice column 11, section steel 12, a connecting steel plate 13, a reinforcement cage 14, a main reinforcement 15 and a connecting reinforcement 16; the ground is wall 1 even, continuous beam 2 and steel shotcrete 9 constitute the major structure of the device even, the inside of wall 1 even is provided with lattice column 11 and steel reinforcement cage 14, lattice column 11 comprises four shaped steel 12, four shaped steel 12 are the rectangle setting, then weld four shaped steel 12 through connecting steel plate 13, the lower extreme fixed mounting of lattice column 11 has stand stake 10, the inboard fixed steel reinforcement cage 14 that is provided with of lattice column 11, steel reinforcement cage 14 includes main muscle 15 and connecting rib 16, every main muscle 15 all welds together through connecting rib 16, the outside fixed welding of lattice column 11 has pre-buried steel sheet 3, be provided with the screw hole on the pre-buried steel sheet 3, and the screw hole fit is connected with fastening bolt 4, pre-buried steel sheet 3 passes through fastening bolt 4 fixedly connected with continuous beam 2, the inboard fixed welding of continuous beam 2 has hat roof beam 7, crown beam 7 keeps away from one side fixedly connected with mount pad 8 of continuous beam 2, one side rigid coupling that crown beam 7 was kept away from to mount pad 8 has steel shotcrete 9, the downside of continuous beam 2 still runs through and installs supporting steel plate 5, supporting steel plate 5's upper and lower both sides all carry out the rigid coupling through expansion bolts 6 and continuous beam 2.

The connection of the steel support and the continuous beam comprises the following steps:

preparing before construction, wherein before the rotary drilling rig is constructed, a measuring team measures a rotary drilling rod to ensure that the verticality of the rod is not more than 1/150 and a steel reinforcement cage is manufactured;

step two, mounting lattice columns, connecting the square lattice columns with temporary upright column piles, and simultaneously lowering the upright column piles and the lattice columns to ensure that the directions of the lattice columns are consistent and the lattice columns are vertical, so that the spacing between the lattice columns is the same as that of a drawing;

step three, constructing the underground embedded plate of the diaphragm wall;

step four, determining a suspension device, wherein the station is a deep foundation pit large-span foundation pit, the middle of the station is provided with a connecting beam, the whole steel support cannot be smoothly installed and removed, and the length and the weight of the phi 800X 16mm steel support is 28m and about 10t, so that a double-hook 10+10t15t single-leg cantilever gantry crane is selected to ensure the construction safety;

step five, assembling the steel supports in sections; the total length of the steel support is about 28m, and the steel support needs to be hoisted in two sections according to design requirements.

The steel reinforcement cage 14 and the lattice column 11 need to be welded twice in the middle in the lowering process, each welding is strictly measured according to data, the distance between each side of the lattice column 11 and the outer side of the steel reinforcement cage 14 is ensured to be 30cm, the verticality of the joint is measured by a horizontal ruler, so that the lattice column 11 can be conveniently connected to the same vertical surface up and down, the whole verticality is ensured, the top end of the lattice column 11 is welded with a 'cross-shaped lattice' steel bar, the distance between the length of the steel bar and a protective sleeve is 1-2cm, the direction of the lattice column 11 is conveniently ensured, the lattice column 11 is prevented from being inclined, a groove section is arranged in the underground connecting wall 1, after the groove section is excavated, the deviation condition of the groove section is checked through an ultrasonic detector, the deviation of the embedded steel plate 3 is conveniently adjusted in time according to the deviation condition of the groove section of the underground connecting wall 1, the deviation of the steel reinforcement cage, cause to have the gap between stiff end and the pre-buried steel sheet 3, steel shotcrete 9 need divide into two sections hoists, and subaerial first splices into two sections with steel shotcrete 9, and loose end one section is about 15m, and the distolateral length of fixed is about 13m, places steel shotcrete 9 long sections on connecting beam 2 earlier, and the nipple joint hoist is as for the long section corresponding position again, is convenient for guarantee that the steel shotcrete is installed fast.

The working principle is as follows: when the open cut foundation pit continuous beam capable of being rapidly installed with the steel support is used, before the rotary drilling rig is constructed, a measuring team measures a rotary drilling rod, the verticality of the drilling rod is not more than 1/150 and the steel reinforcement cage 14 is manufactured; then, a lattice column 11 is installed, a square lattice column 11 is connected with a temporary column pile 10, the column piles 10 and the lattice columns 11 are put down at the same time, in order to ensure that the direction of the lattice columns 11 is consistent and the lattice columns 11 are vertical, the spacing between the lattice columns 11 is the same as that of a drawing, by means of placing a reinforcement cage 14 in the lattice columns 11 and constructing a pre-embedded steel plate 3 in an underground connecting wall on the outer side of the lattice columns 11, after the construction is finished, a double-hook 10+10t15t single-leg cantilever gantry crane is adopted to hoist the steel support 9, the steel support 9 is connected with a connecting beam 2, after the connection is finished, the axial force of the steel support 9 is applied, and a supporting steel plate 5 is installed to prevent the steel support 9 from falling off, the installation time of the steel support 9 is reduced by controlling the underground connecting wall (1) and the pre-embedded steel plate 3, selecting the gantry crane and sectioning the steel support 9, and simultaneously ensuring that the steel support 9 is vertical to the pre-embedded steel plate 3, and reducing the, through the measures, the installation time of the connecting beam 2 and the steel support 9 is greatly reduced, the blanking and assembling time is completely advanced, the stability and the rapidness in construction are ensured, and the construction speed is greatly improved.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (6)

1. The utility model provides a can with open cut foundation ditch continuous beam of quick installation of steel shotcrete which characterized in that: the steel structure comprises a ground coupling wall (1), a continuous beam (2), an embedded steel plate (3), a fastening bolt (4), a supporting steel plate (5), an expansion bolt (6), a crown beam (7), a mounting seat (8), a steel support (9), a stand column pile (10), a lattice column (11), section steel (12), a connecting steel plate (13), a reinforcement cage (14), a main reinforcement (15) and a connecting reinforcement (16);

the ground connection wall (1), the continuous beam (2) and the steel support (9) form a main body structure of the device, a lattice column (11) and a steel reinforcement cage (14) are arranged inside the ground connection wall (1), the lattice column (11) is composed of four section steels (12), the four section steels (12) are arranged in a rectangular shape, the four section steels (12) are welded through a connecting steel plate (13), a vertical column pile (10) is fixedly installed at the lower end of the lattice column (11), and the steel reinforcement cage (14) is fixedly arranged on the inner side of the lattice column (11);

the reinforcement cage (14) comprises main reinforcements (15) and connecting reinforcements (16), each main reinforcement (15) is welded together through the connecting reinforcements (16), an embedded steel plate (3) is fixedly welded on the outer side of the lattice column (11), a threaded hole is formed in the embedded steel plate (3), and the threaded hole is matched and connected with a fastening bolt (4), the embedded steel plate (3) is fixedly connected with a continuous beam (2) through the fastening bolt (4), a crown beam (7) is fixedly welded on the inner side of the continuous beam (2), one side of the crown beam (7) far away from the continuous beam (2) is fixedly connected with a mounting seat (8), a steel support (9) is fixedly connected to one side of the mounting seat (8) far away from the crown beam (7), a supporting steel plate (5) is also arranged at the lower side of the continuous beam (2) in a penetrating way, the upper side and the lower side of the supporting steel plate (5) are fixedly connected with the continuous beam (2) through expansion bolts (6).

2. The open cut foundation pit continuous beam capable of being rapidly installed with the steel support according to claim 1, wherein: the steel reinforcement cage (14) and the lattice column (11) need to be welded twice in the middle in the lowering process, each welding is strictly measured according to data, the distance between each edge of the lattice column (11) and the outer side of the steel reinforcement cage (14) is guaranteed to be 30cm, and the verticality of the joint is measured by a horizontal ruler.

3. The open cut foundation pit continuous beam capable of being rapidly installed with the steel support according to claim 1, wherein: the top end of the lattice column (11) is welded with a 'cross-shaped lattice' reinforcing steel bar, and the length of the reinforcing steel bar is 1-2cm away from the pile casing.

4. The open cut foundation pit continuous beam capable of being rapidly installed with the steel support according to claim 1, wherein: the underground diaphragm wall is characterized in that a groove section is formed in the underground diaphragm wall (1), and after the groove section is excavated, the deviation condition of the groove section is checked through an ultrasonic detector.

5. The open cut foundation pit continuous beam capable of being rapidly installed with the steel support according to claim 1, wherein: the steel support (9) needs to be hoisted into two sections, the steel support (9) is firstly spliced into two sections on the ground, one section of the movable end is about 15m, the length of the fixed end side is about 13m, the long section of the steel support (9) is firstly placed on the connecting beam (2), and then the short section is hoisted to the corresponding position of the long section.

6. The open cut foundation pit continuous beam capable of being rapidly installed with the steel support according to claim 1, wherein: the connection of the steel support and the continuous beam comprises the following steps:

preparing before construction, wherein before the rotary drilling rig is constructed, a measuring team measures a rotary drilling rod to ensure that the verticality of the rod is not more than 1/150 and a steel reinforcement cage is manufactured;

step two, mounting lattice columns, connecting the square lattice columns with temporary upright column piles, and simultaneously lowering the upright column piles and the lattice columns to ensure that the directions of the lattice columns are consistent and the lattice columns are vertical, so that the spacing between the lattice columns is the same as that of a drawing;

step three, constructing the underground embedded plate of the diaphragm wall;

step four, determining a suspension device, wherein the station is a deep foundation pit large-span foundation pit, the middle of the station is provided with a connecting beam, the whole steel support cannot be smoothly installed and removed, and the length and the weight of the phi 800X 16mm steel support is 28m and about 10t, so that a double-hook (10+10t)15t single-leg cantilever gantry crane is selected to ensure the construction safety;

step five, assembling the steel supports in sections; the total length of the steel support is about 28m, and the steel support needs to be hoisted in two sections according to design requirements.

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