CN107059880B - Reinforcing structure of concrete-fabricated section steel mixed support system of ultra-large deep foundation pit and construction method thereof - Google Patents
Reinforcing structure of concrete-fabricated section steel mixed support system of ultra-large deep foundation pit and construction method thereof Download PDFInfo
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- CN107059880B CN107059880B CN201710136892.1A CN201710136892A CN107059880B CN 107059880 B CN107059880 B CN 107059880B CN 201710136892 A CN201710136892 A CN 201710136892A CN 107059880 B CN107059880 B CN 107059880B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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Abstract
The invention relates to a construction method of a reinforced structure of a concrete-fabricated section steel mixed support system of an oversized deep foundation pit, which comprises the following steps: constructing a foundation pit and a support system of the foundation pit, wherein the support system comprises a concrete support and a steel support which are arranged in the foundation pit; constructing a first lattice column supported at the bottom of the concrete support in the foundation pit; constructing a second lattice column close to the steel support in the foundation pit; fixedly connecting and supporting first supporting beams of the steel supports on two sides of the second lattice column; and providing a sliding support, clamping and fixing the first support beam and the steel support by using the sliding support, wherein the steel support can slide along the supporting direction. The reinforced structure is used for reinforcing the support system, presss from both sides through sliding support and presss from both sides the vertical displacement who has restricted the steel shotcrete, and the steel shotcrete can be followed and established the direction slip, can release axial displacement, avoids axial displacement to produce side direction effort and displacement to second lattice column, ensures the vertical stability that bears of second lattice column.
Description
Technical Field
The invention relates to the field of foundation pit support in building construction, in particular to a reinforcing structure of a concrete-fabricated section steel mixed support system for an oversized deep foundation pit and a construction method thereof.
Background
In a foundation pit supporting system, the large-scale deep foundation pit section steel-concrete combined supporting system has the advantages of adaptability to complex foundation pit shapes, suitability for supporting large-scale plane foundation pits, high supporting rigidity, reusability of supporting materials, short construction period, less generated building waste and the like. The steel shotcrete among the current shaped steel bearing structure is in the same place with the connected node of lattice column or stand usually adopts welding or bolted connection, this connected mode leads to shaped steel braced system's accident more, the reason is because the soil body of foundation ditch periphery can produce soil pressure to shaped steel bearing structure, the soil pressure to the steel shotcrete in the foundation ditch produces axial direction promptly, the steel shotcrete produces axial displacement under the effect of soil pressure, and then cause too big additional displacement to stand or lattice column, make stand or lattice column destroyed, thereby cause the potential safety hazard. In addition, in the section steel supporting structure, the supporting system of the lattice column is changed, so that the axial pressure bearing capacity of the lattice column is obviously reduced, and particularly, the reinforcing structure of the lattice column under the construction trestle for running heavy-duty vehicles needs to pay attention.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a reinforcing structure of a concrete-assembled profile steel mixed supporting system of an oversized deep foundation pit and a construction method thereof, and solves the problems that the steel support and a lattice column cannot release axial displacement of the steel support under the action of soil pressure by adopting a welding or bolt connection mode, so that the lattice column is subjected to overlarge additional displacement, and further the potential safety hazard is caused by damage to the lattice column.
The technical scheme for realizing the purpose is as follows:
the invention provides a construction method of a reinforced structure of a concrete-fabricated section steel mixed support system of an oversized deep foundation pit, which comprises the following steps:
constructing a foundation pit and a support system of the foundation pit, wherein the support system comprises a concrete support and a steel support which are arranged in the foundation pit;
constructing a first lattice column supported at the bottom of the concrete support in the foundation pit;
constructing a second lattice column close to the steel support in the foundation pit;
fixedly connecting and supporting first supporting beams of the steel supports on two sides of the second latticed column; and
and providing a sliding support, and clamping and fixing the first support beam and the steel support by using the sliding support, wherein the steel support can slide on the sliding support along the supporting direction of the steel support.
The supporting system of the foundation pit is used for controlling the deformation of the foundation pit, and the reinforcing structure provided by the invention is used for reinforcing the supporting system and improving the stability of the foundation pit. The first lattice column and the second lattice column are arranged to transmit vertical load of the supporting system, and powerful support is provided for the supporting system. Utilize first supporting beam bearing steel shotcrete, and press from both sides tight steel shotcrete and first supporting beam through sliding support, restricted the vertical displacement of steel shotcrete, and the steel shotcrete can be followed and established the direction and slide, can release the axial displacement that the steel shotcrete produced because of receiving foundation ditch side direction soil pressure, avoided axial displacement to produce side direction effort and displacement to the second lattice column, ensure the vertical stability that bears of second lattice column, effectively protected the structure safety and stability of second lattice column. The vertical load of the steel support is transmitted to the second lattice column through the supporting beam at the lower part of the steel support, and a connecting structure which is stable in stress, firm and reliable is formed.
The construction method of the reinforced structure of the concrete-fabricated section steel mixed support system of the ultra-large deep foundation pit is further improved in that the construction method further comprises the following steps:
fixedly connecting the first support beam with other second latticed columns in the arrangement direction of the first support beam;
providing a second support beam, fixedly connecting the second support beam to the other two sides of the second lattice column relative to the two sides of the first support beam, and fixedly connecting the second support beam to other second lattice columns in the arrangement direction of the second support beam.
The construction method of the reinforced structure of the concrete-fabricated section steel mixed support system of the ultra-large deep foundation pit is further improved in that the construction method further comprises the following steps:
and providing a bracket, and installing the bracket at the joint of the first supporting beam and the second lattice column and the joint of the second supporting beam and the second lattice column.
The construction method of the reinforced structure of the concrete-fabricated section steel mixed support system of the ultra-large deep foundation pit is further improved in that the sliding support comprises a clamping assembly, a first sliding layer and a second sliding layer; the fixing of the first support beam and the steel support with the sliding support clamp comprises:
clamping the clamping assembly to the top of the steel support and the bottom of the first support beam, and clamping the steel support and the first support beam through the clamping assembly;
cushioning the first skid layer between the clamping assembly and the top of the steel support;
and arranging the second sliding layer pad between the bottom of the steel support and the top of the first support beam.
The construction method of the reinforced structure of the concrete-assembled profile steel mixed support system of the ultra-large deep foundation pit is further improved in that the sliding support also comprises a limiting piece;
and fixedly arranging the limiting pieces on the first supporting beam and on two sides of the steel support, so that the limiting pieces limit the lateral displacement of the steel support.
The invention also provides a reinforcing structure of the concrete-assembled profile steel mixed supporting system of the ultra-large deep foundation pit, wherein the foundation pit supporting system comprises a concrete support and a steel support which are arranged in the foundation pit, and the reinforcing structure comprises:
the first lattice column is supported at the bottom of the concrete support and is vertically arranged in the foundation pit;
the second latticed column is vertically arranged in the foundation pit and is close to the steel support;
the first supporting beams are fixed on two sides of the second latticed column and used for supporting the steel supports; and
the first supporting beam and the sliding support of the steel support are clamped and fixed, and the steel support can slide on the sliding support along the supporting direction of the steel support.
The reinforcing structure of the concrete-assembled profile steel mixed supporting system of the ultra-large deep foundation pit further comprises a second supporting beam, wherein the second supporting beam is fixedly connected to the other two sides, opposite to the two sides connected with the first supporting beam, of the second lattice column, and the second supporting beam is fixedly connected with other second lattice columns in the arrangement direction of the second supporting beam; the first supporting beam is fixedly connected with other second latticed columns in the arrangement direction of the first supporting beam.
The reinforcing structure of the concrete-fabricated section steel mixed supporting system of the ultra-large deep foundation pit further comprises a bracket, wherein the bracket is arranged at the joint of the first supporting beam and the second lattice column and the joint of the second supporting beam and the second lattice column.
The invention further improves the reinforcing structure of the concrete-assembled profile steel mixed supporting system of the ultra-large deep foundation pit, wherein the sliding support comprises a clamping component, a first sliding layer and a second sliding layer;
the clamping assembly is clamped at the top of the steel support and the bottom of the first supporting beam, and the steel support and the first supporting beam are clamped through the clamping assembly;
the first sliding layer is arranged between the clamping assembly and the top of the steel support in a cushioning mode;
the second sliding layer is arranged between the bottom of the steel support and the top of the first supporting beam in a cushioning mode.
The invention further improves the reinforcing structure of the concrete-assembled profile steel mixed supporting system of the ultra-large deep foundation pit, wherein the sliding support also comprises a limiting piece; the limiting pieces are fixedly arranged on the first supporting beams and located on two sides of the steel supports, so that the lateral displacement of the steel supports is limited through the limiting pieces.
Drawings
FIG. 1 is a schematic structural diagram of a reinforcing structure of the concrete-fabricated section steel mixed support system of the ultra-large deep foundation pit.
Fig. 2 is an enlarged schematic view of node C in fig. 1.
Fig. 3 is a cross-sectional view a-a of fig. 2.
Fig. 4 is an enlarged schematic view of node D in fig. 1.
Fig. 5 is a sectional view of B-B in fig. 4.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the invention provides a reinforcing structure of a concrete-fabricated section steel mixed supporting system of an oversized deep foundation pit and a construction method thereof, which are used for a steel-concrete combined supporting system, wherein the concrete support and the steel support are provided. In a traditional supporting system, a rigid node is poured together with a concrete support to form a vertically arranged latticed column for transmitting vertical load of the supporting system, so that the latticed column is effectively restrained, and the stable bearing capacity of the latticed column is improved; when the lattice column and the steel support are connected in a welding or bolt mode, axial displacement of the steel support caused by soil pressure cannot be released, and then excessive additional displacement is caused to the lattice column, so that the lattice column is damaged. The reinforcing structure adopts the first supporting beam to support the steel supports, the steel supports are not fixedly connected among the lattice columns, and the sliding support is adopted to provide a sliding function for the steel supports so as to release axial displacement of the steel supports under the action of lateral soil pressure of the foundation pit, so that lateral acting force and displacement on the lattice columns are avoided, the vertical bearing stability of the lattice columns cannot be reduced, and the reinforcing structure has a great effect on the safe and stable stress of the foundation pit steel supports. The first supporting beam and the second supporting beam are adopted to form a column embracing structure for the lattice columns, adjacent lattice columns are pulled into a whole, the two-way deformation of the lattice columns is restrained, the stable bearing capacity of the lattice columns is improved, the vertical load is effectively transmitted, and the problem of a reinforcing method of the lattice columns under the construction trestle in the profile steel supporting structure can be solved. The reinforced structure of the concrete-fabricated section steel mixed support system for the ultra-large deep foundation pit and the construction method thereof are described below with reference to the accompanying drawings.
As shown in fig. 1, the reinforcing structure of the concrete-fabricated section steel hybrid supporting system of the ultra-large deep foundation pit provided by the invention is used for reinforcing a supporting system 22, the supporting system 22 of the foundation pit comprises a concrete support 221 and a steel support 222 which are erected in the foundation pit 11, and as shown in fig. 4, the reinforcing structure of the invention comprises a first lattice column 31, a second lattice column 32, a first supporting beam 33, a second supporting beam 34 and a sliding support 35, the first lattice column 31 is supported at the bottom of the concrete support 221, the first lattice column 31 is erected in the foundation pit 11 and is used for transmitting the vertical load of the concrete support 221, a connecting node of the first lattice column 31 and the concrete support 221 adopts a concrete-poured rigid node, and the concrete supports in two directions can effectively restrain the first lattice column and improve the stable bearing capacity thereof; the second lattice column 32 is vertically arranged in the foundation pit 11 and is close to the steel support 222; referring to fig. 2, the first supporting beam 33 is fixed on two sides of the second lattice column 32 for supporting the steel support 222, the first supporting beam 33 is perpendicular to the steel support 222, the second lattice column 32 has four side surfaces, namely a first side surface 321, a second side surface 322, a third side surface 323 and a fourth side surface 324, and the first supporting beam 33 is disposed on the third side surface 323 and the fourth side surface 324. The first support beam 33 and the steel support 222 are clamped and fixed by the sliding support 35, and the steel support 222 can slide on the sliding support 35 along the supporting direction of the steel support 222 by clamping and fixing the first support beam 33 and the steel support 222 through the sliding support 35. Make steel shotcrete 222 to release axial displacement through this slip function, and steel shotcrete 222 does not connect with second lattice column 32, can not transmit axial displacement for second lattice column 32, avoids the influence to second lattice column 32 stability. The steel support 222 is supported by the first support beam 33, so that the vertical displacement of the steel support can be limited, the lateral acting force and displacement are not generated on the second lattice column, and the vertical bearing stability of the second lattice column is not reduced. The vertical load of the steel support is transmitted to the second latticed column through the first support beam on the lower portion of the second latticed column by utilizing the fixed connection of the first support beam and the second latticed column, and the sliding support realizes and forms two sets of horizontal and vertical support systems which work independently and assist each other, so that the sliding support has a great effect on the stress safety and stability of a foundation pit support system.
As shown in fig. 1 and 2, as a preferred embodiment of the present invention, the reinforcing structure further includes a second supporting beam 34, the second supporting beam 34 is fixedly connected to the second lattice column 32 at the other two sides opposite to the two sides connecting the first supporting beam 33, that is, the second supporting beam 34 is fixedly connected to the first side 321 and the second side 322 of the second lattice column 32. Like this second supporting beam 34 and first supporting beam 33 locate four sides of second lattice column 32, have formed the pillar embracing structure of constituteing by second supporting beam 34 and first supporting beam 33 on second lattice column 32, such pillar embracing structure can restrain the two-way deformation of second lattice column, improves its stable bearing capacity, effectively transmits the vertical load of support system. Preferably, the second supporting beam 34 is fixedly connected to the other second lattice columns 32 in the arrangement direction thereof, that is, the second supporting beam 34 is fixedly connected to the plurality of second lattice columns 32 in the arrangement direction thereof, so as to tie and fixedly connect the plurality of second lattice columns 32 into a whole, thereby forming an integral stress system and preventing the second lattice columns from deforming. The first supporting beam 33 is fixedly connected with the other second latticed columns 32 in the arrangement direction, namely, the first supporting beam 33 is fixedly connected with the second latticed columns 32 in the arrangement direction, and the second latticed columns 32 are fixedly connected into a whole by pulling, so that an integral stress system is formed, and the deformation of the second latticed columns is prevented.
As shown in fig. 1 to 3, as another preferred embodiment of the present invention, the reinforcing structure further includes a bracket 36, the bracket 36 is installed at a connection portion of the first supporting beam 33 and the second lattice column 32 and a connection portion of the second supporting beam 34 and the second lattice column 32, the first supporting beam 33 and the second supporting beam 34 are installed by using the bracket 36, the bracket 36 is fixed on the second lattice column 32 to provide an installation position for the first supporting beam 33 and the second supporting beam 34, and the bracket 36 is arranged on upper and lower sides of the first supporting beam 33 and the second supporting beam 34 to sandwich and fix the first supporting beam 33 and the second supporting beam 34.
As shown in fig. 1, 4 and 5, as a further preferred embodiment of the present invention, the sliding support 35 comprises a clamping assembly 351, a first sliding layer 352 and a second sliding layer 353, wherein the clamping assembly 351 clamps the top of the steel support 222 and the bottom of the first support beam 33, and the steel support 222 and the first support beam 33 are clamped by the clamping assembly 351; a first skid layer 352 is cushioned between the clamping assembly 351 and the top of the steel support 222; second skid layer 353 pad is provided between the bottom of steel support 222 and the top of first support beam 33. By providing the first and second slipping layers 352 and 353, the steel support 222 can be provided with a function of sliding in the direction in which it is provided, so as to release the axial displacement of the steel support 222.
In another preferred embodiment of the present invention, the sliding support 35 further includes a limiting member 354, the limiting member 354 is fixed on the first support beam 33 and located at two sides of the steel support 222, the limiting member 354 is used to limit the lateral displacement of the steel support 222, i.e. the steel support 222 is clamped by two limiting members 354 fixed on the first support beam 33, the two limiting members 354 are arranged at two sides of the lower flange plate of the steel support to prevent the lateral displacement of the steel support 222, preferably, the limiting member 354 is an L-type member, and includes a first limiting plate and a second limiting plate which are vertically connected to each other, the first limiting plate is fixed on the first support beam 33, the second limiting plate abuts against one side of the lower flange plate of the steel support 222, and the limiting member 354 is preferably an angle steel.
As shown in fig. 4 and 5, as still another preferred embodiment of the present invention, the clamping assembly 351 includes a first clamping member 3511 disposed at the top of the steel support 222, a second clamping member 3512 disposed at the bottom of the first support beam 33, and a fastening connection rod 3513 penetrating the first clamping member 3511 and the second clamping member 3512, the fastening connection rod 3513 being provided at both sides of the steel support 222, and the first clamping member 3511 and the second clamping member 3512 are fastened by the fastening connection rod 3513 such that the first clamping member 3511 and the second clamping member 3512 clamp the steel support 222 and the first support beam 33, and the vertical displacement of the steel support 222 is limited. As still another preferred embodiment of the present invention, the first clamping member 3511 and the second clamping member 3512 are disposed in an inclined shape, i.e., they intersect the first supporting beam 33 at an included angle, and the fastening connection rods 3513 are disposed at both sides of the first supporting beam 33. The first clamping piece 3511 and the second clamping piece 3512 are made of angle steel, and the fastening connecting rod 3513 is made of a long bolt.
The first slip layer 352 and the second slip layer 353 are preferably in the form of a film. The axial displacement of the steel support can be released, and the vertical clamping connection of the steel support cannot be influenced.
The reinforcing structure of the concrete-assembled profile steel mixed supporting system of the ultra-large deep foundation pit has the beneficial effects that:
adopt sliding support to connect foundation ditch steel shotcrete and lattice column, sliding support comprises long bolt, angle steel and slip film, can release the axial displacement of steel shotcrete to restrict the vertical displacement of steel shotcrete. The steel support is placed on the two support beams at the lower part, and the support beams are connected with the lattice columns in a welding mode. In order to reduce the lateral calculation length of the steel support, limiting parts are respectively arranged on two sides of a lower flange of the steel support to limit the lateral displacement of the steel support. When the steel shotcrete received foundation ditch side direction soil pressure effect and produced axial displacement, its axial displacement was released to this sliding support of accessible, does not produce side direction effort and displacement to the lattice column moreover, does not reduce the vertical stability of bearing of lattice column, through this sliding support promptly for foundation ditch steel shotcrete system forms two sets of autonomous working, the level and the vertical braces system of helping each other, and the atress safety and stability to foundation ditch steel shotcrete system has very big effect. The vertical load of the steel support is transferred to the lattice column through the support beam at its lower part.
Adopt first supporting beam and second supporting beam to form two-way double pin member and retrain the lattice column, can retrain the two-way deformation of lattice column, improve its bearing capacity and stability, effectively transmit the load of support system, ensure foundation ditch bearing structure's stability, effectively control foundation ditch deformation.
The construction method of the reinforcing structure of the concrete-fabricated section steel mixed supporting system of the ultra-large deep foundation pit provided by the invention is explained below.
The invention provides a construction method of a reinforced structure of a concrete-fabricated section steel mixed support system of an oversized deep foundation pit, which comprises the following steps:
as shown in fig. 1, a foundation pit 11 and a support system 22 of the foundation pit 11 are constructed, wherein the support system 22 comprises a concrete support 221 and a steel support 222 erected in the foundation pit 11;
constructing a first lattice column 31 supported at the bottom of the concrete support 221 in the foundation pit 11;
constructing a second lattice column 32 close to the steel support 222 in the foundation pit 11;
referring to fig. 2, the first support beams 33 supporting the steel supports 222 are fixedly connected to both sides of the second lattice column 32; and
referring to fig. 4, a sliding support 35 is provided, the sliding support 35 is used to clamp and fix the first support beam 33 and the steel support 222, and the steel support 222 can slide on the sliding support 35 along the supporting direction of the steel support 222.
When the first lattice column 31 is constructed, the first lattice column 31 is vertically arranged in the foundation pit 11 and used for transmitting the vertical load of the concrete support 221, the connecting node of the first lattice column 31 and the concrete support 221 adopts a concrete poured rigid node, and the concrete supports in two directions can effectively restrain the first lattice column and improve the stable bearing capacity of the first lattice column. The second lattice column 32 is vertically arranged in the foundation pit 11 and is close to the steel support 222; referring to fig. 2, the first supporting beam 33 is fixed on two sides of the second lattice column 32 for supporting the steel support 222, the first supporting beam 33 is perpendicular to the steel support 222, the second lattice column 32 has four side surfaces, namely a first side surface 321, a second side surface 322, a third side surface 323 and a fourth side surface 324, and the first supporting beam 33 is disposed on the third side surface 323 and the fourth side surface 324.
The supporting system of the foundation pit is used for controlling the deformation of the foundation pit, and the reinforcing structure provided by the invention is used for reinforcing the supporting system and improving the stability of the foundation pit. The first lattice column and the second lattice column are arranged to transmit vertical load of the supporting system, and powerful support is provided for the supporting system. The sliding function provided by the sliding support enables the steel support 222 to release the axial displacement, and the steel support 222 is not connected to the second lattice column 32, so that the axial displacement is not transmitted to the second lattice column 32, and the influence on the stability of the second lattice column 32 is avoided. The steel support 222 is supported by the first support beam 33, so that the vertical displacement of the steel support can be limited, the lateral acting force and displacement are not generated on the second lattice column, and the vertical bearing stability of the second lattice column is not reduced. The vertical load of the steel support is transmitted to the second latticed column through the first support beam on the lower portion of the second latticed column by utilizing the fixed connection of the first support beam and the second latticed column, and the sliding support realizes and forms two sets of horizontal and vertical support systems which work independently and assist each other, so that the sliding support has a great effect on the stress safety and stability of a foundation pit support system.
As a preferred embodiment of the construction method of the present invention, the method further includes:
as shown in fig. 1 and 2, the first support beam 33 is fixedly connected to the other second lattice column 32 in the arrangement direction thereof; the first supporting beam 33 is fixedly connected with the plurality of second latticed columns 32 positioned in the arrangement direction of the first supporting beam, and the plurality of second latticed columns 32 are fixedly connected into a whole in a pulling mode to form an integral stress system, so that the second latticed columns are prevented from deforming. A second support beam 34 is provided, the second support beam 34 is fixedly connected to the other two sides of the second lattice column 32 with respect to the two sides to which the first support beam 33 is connected, and the second support beam 34 is fixedly connected to the other second lattice column 32 in the direction in which it is installed. That is, the second support beam 34 is fixedly attached to the first side 321 and the second side 322 of the second lattice column 32. Like this second supporting beam 34 and first supporting beam 33 locate four sides of second lattice column 32, have formed the pillar embracing structure of constituteing by second supporting beam 34 and first supporting beam 33 on second lattice column 32, such pillar embracing structure can restrain the two-way deformation of second lattice column, improves its stable bearing capacity, effectively transmits the vertical load of support system. Preferably, the second supporting beam 34 is fixedly connected to the plurality of second lattice columns 32 in the arrangement direction thereof, so as to tie and fixedly connect the plurality of second lattice columns 32 into a whole, thereby forming an integral stress system and preventing the second lattice columns from deforming.
As another preferred embodiment of the construction method of the present invention, as shown in fig. 1 and 3, the construction method further includes: and providing a bracket 36, and arranging the bracket 36 at the joint of the first supporting beam 33 and the second lattice column 32 and the joint of the second supporting beam 34 and the second lattice column 32. The first support beam 33 and the second support beam 34 are installed by using the bracket 36, the bracket 36 is fixed on the second lattice column 32 to provide an installation position for the first support beam 33 and the second support beam 34, and the bracket 36 is arranged on the upper and lower sides of the first support beam 33 and the second support beam 34 to clamp and fix the first support beam 33 and the second support beam 34.
As still another preferred embodiment of the construction method of the present invention, as shown in fig. 4 and 5, the shoe 35 includes a clamping assembly 351, a first slipping layer 352 and a second slipping layer 353; the clamping and fixing of the first support beam 33 and the steel support 222 by means of the sliding support 35 comprises:
clamping the clamping assembly 351 to the top of the steel support 222 and the bottom of the first support beam 33, clamping the steel support and the first support beam by the clamping assembly 351; cushioning the first skid layer 352 between the clamping assembly and the top of the steel support; a second skid layer 353 pad is provided between the bottom of the steel support and the top of the first support beam. By providing the first and second slipping layers 352 and 353, the steel support 222 can be provided with a function of sliding in the direction in which it is provided, so as to release the axial displacement of the steel support 222.
As another preferred embodiment of the construction method of the present invention, the sliding support 35 further comprises a stopper 354, wherein the stopper is fixed on the first support beam and located at both sides of the steel support, so as to limit the lateral displacement of the steel support through the stopper 354, the stopper 354 is used to limit the lateral displacement of the steel support 222, that is, the steel support 222 is clamped by two stoppers 354 fixed on the first support beam 33, the two stoppers 354 are arranged at both sides of the lower flange plate of the steel support, so as to prevent the lateral displacement of the steel support 222, preferably, the stopper 354 is an L type member, and comprises a first stopper plate and a second stopper plate which are vertically connected with each other, the first stopper is fixed on the first support beam 33, the second stopper plate abuts against one side of the lower flange plate of the steel support 222, and the stopper 354 is preferably an angle steel.
As shown in fig. 4 and 5, as still another preferred embodiment of the present invention, the clamping assembly 351 includes a first clamping member 3511 disposed at the top of the steel support 222, a second clamping member 3512 disposed at the bottom of the first support beam 33, and a fastening connection rod 3513 penetrating the first clamping member 3511 and the second clamping member 3512, the fastening connection rod 3513 being provided at both sides of the steel support 222, and the first clamping member 3511 and the second clamping member 3512 are fastened by the fastening connection rod 3513 such that the first clamping member 3511 and the second clamping member 3512 clamp the steel support 222 and the first support beam 33, and the vertical displacement of the steel support 222 is limited. As still another preferred embodiment of the present invention, the first clamping member 3511 and the second clamping member 3512 are disposed in an inclined shape, i.e., they intersect the first supporting beam 33 at an included angle, and the fastening connection rods 3513 are disposed at both sides of the first supporting beam 33. The first clamping piece 3511 and the second clamping piece 3512 are made of angle steel, and the fastening connecting rod 3513 is made of a long bolt. The first slip layer 352 and the second slip layer 353 are preferably in the form of a film. The axial displacement of the steel support can be released, and the vertical clamping connection of the steel support cannot be influenced.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (4)
1. A construction method for a reinforced structure of a concrete-fabricated section steel mixed support system of an oversized deep foundation pit is characterized by comprising the following steps:
constructing a foundation pit and a support system of the foundation pit, wherein the support system comprises a concrete support and a steel support which are arranged in the foundation pit;
constructing a first lattice column supported at the bottom of the concrete support in the foundation pit;
constructing a second lattice column close to the steel support in the foundation pit;
fixedly connecting and supporting first supporting beams of the steel supports on two sides of the second latticed column; and
providing a sliding support, and clamping and fixing the first support beam and the steel support by using the sliding support, wherein the steel support can slide on the sliding support along the supporting direction of the steel support; further comprising:
fixedly connecting the first support beam with other second latticed columns in the arrangement direction of the first support beam;
providing a second supporting beam, fixedly connecting the second supporting beam to the other two sides of the second latticed column relative to the two sides of the first supporting beam, and fixedly connecting the second supporting beam with other second latticed columns in the arrangement direction of the second supporting beam, so that a column embracing structure consisting of the second supporting beam and the first supporting beam is formed;
the sliding support comprises a clamping assembly, a first sliding layer and a second sliding layer; the fixing of the first support beam and the steel support with the sliding support clamp comprises:
clamping the clamping assembly to the top of the steel support and the bottom of the first support beam, and clamping the steel support and the first support beam through the clamping assembly;
cushioning the first skid layer between the clamping assembly and the top of the steel support;
arranging the second sliding layer pad between the bottom of the steel support and the top of the first support beam;
the clamping assembly comprises a first clamping piece arranged at the top of the steel support, a second clamping piece arranged at the bottom of the first support beam and a fastening connecting rod penetrating through the first clamping piece and the second clamping piece, the fastening connecting rod is arranged on two sides of the steel support and also arranged on two sides of the corresponding first support beam, and the first clamping piece and the second clamping piece are fastened and connected through the fastening connecting rod, so that the steel support and the first support beam are clamped by the first clamping piece and the second clamping piece;
further comprising:
and providing a bracket, and installing the bracket at the joint of the first supporting beam and the second lattice column and the joint of the second supporting beam and the second lattice column.
2. The construction method of the reinforcing structure of the ultra-large deep foundation pit concrete-fabricated section steel hybrid supporting system according to claim 1, wherein the sliding support further comprises a limiting member;
and fixedly arranging the limiting pieces on the first supporting beam and on two sides of the steel support, so that the limiting pieces limit the lateral displacement of the steel support.
3. The utility model provides a reinforced structure of super large deep basal pit concrete-assembled shaped steel hybrid stay system, this supporter system is including propping up concrete support and the steel shotcrete of locating in the foundation ditch, its characterized in that, reinforced structure includes:
the first lattice column is supported at the bottom of the concrete support and is vertically arranged in the foundation pit;
the second latticed column is vertically arranged in the foundation pit and is close to the steel support;
the first supporting beams are fixed on two sides of the second latticed column and used for supporting the steel supports; and
the sliding support is used for clamping and fixing the first support beam and the steel support, and the steel support can slide on the sliding support along the supporting direction of the steel support; the second support beam is fixedly connected to the other two sides of the second lattice column, which are opposite to the two sides of the first support beam, and the second support beam is fixedly connected with other second lattice columns in the arrangement direction of the second support beam; the first supporting beam is fixedly connected with other second latticed columns in the arrangement direction of the first supporting beam, so that a column embracing structure consisting of the second supporting beam and the first supporting beam is formed;
the sliding support comprises a clamping assembly, a first sliding layer and a second sliding layer;
the clamping assembly is clamped at the top of the steel support and the bottom of the first supporting beam, and the steel support and the first supporting beam are clamped through the clamping assembly;
the first sliding layer is arranged between the clamping assembly and the top of the steel support in a cushioning mode;
the second sliding layer is arranged between the bottom of the steel support and the top of the first supporting beam in a cushioning mode; the clamping assembly comprises a first clamping piece arranged at the top of the steel support, a second clamping piece arranged at the bottom of the first support beam and a fastening connecting rod penetrating through the first clamping piece and the second clamping piece, the fastening connecting rod is arranged at two sides of the steel support, and the first clamping piece and the second clamping piece are fastened and connected through the fastening connecting rod, so that the first clamping piece and the second clamping piece clamp the steel support and the first support beam;
still include the bracket, the bracket install in first supporting beam with the junction of second lattice column with the second supporting beam with the junction of second lattice column.
4. The reinforcing structure of the ultra-large deep foundation pit concrete-fabricated section steel hybrid supporting system according to claim 3, wherein the sliding support further comprises a limiting member; the limiting pieces are fixedly arranged on the first supporting beams and located on two sides of the steel supports, so that the lateral displacement of the steel supports is limited through the limiting pieces.
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| CN201710136892.1A CN107059880B (en) | 2017-03-09 | 2017-03-09 | Reinforcing structure of concrete-fabricated section steel mixed support system of ultra-large deep foundation pit and construction method thereof |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107558665A (en) * | 2017-10-07 | 2018-01-09 | 吕琳 | A kind of novel ultralong lattice column |
| CN107842027A (en) * | 2017-12-08 | 2018-03-27 | 江苏东合南岩土科技股份有限公司 | A kind of foundation ditch combined type type steel support beam and its method of construction |
| CN108425365A (en) * | 2018-05-16 | 2018-08-21 | 中国建筑第八工程局有限公司 | Displacement adjustment device and its construction method for H profile steel support |
| CN114197486B (en) * | 2021-12-23 | 2023-04-07 | 江苏雷威建设工程有限公司 | Deep basal pit assembled shaped steel bearing structure |
| CN115492122A (en) * | 2022-09-23 | 2022-12-20 | 中冶华天南京工程技术有限公司 | Fabricated lateral force resisting bracket for deep foundation pit section steel support and construction method |
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