CN215948206U - Bracing structure of beam string - Google Patents

Abstract

The utility model relates to a bracing structure for a beam string, which comprises a plurality of bracing devices, a plurality of prestress applying devices and a plurality of tensile devices. The bracing device is provided with bracing girder and the linkage unit, and the linkage unit is provided with one with the bracing girder at least. The two ends of the diagonal bracing girder are provided with first connecting plates, the two ends of the connecting unit are provided with second connecting plates, and the diagonal bracing girder and the connecting unit are connected through the first connecting plates and the second connecting plates through bolts. The ribbed slab sets up to right trapezoid structure, and the ribbed slab is used for strengthening the bearing capacity of first connecting plate and second connecting plate. The prestress applying device is arranged at one end of the inclined strut device and is used for enabling the bracing structure of the beam string beam to be connected with the concrete beam in an extrusion mode. One end of the tensile device is connected with the concrete beam, and the other end of the tensile device is connected with the prestress applying device. The beam string inclined strut structure is formed by splicing a plurality of small components, the hoisting efficiency is improved, and the cost is saved.

Description

Bracing structure of beam string

Technical Field

The utility model relates to the field of foundation pit supporting, in particular to a beam string diagonal bracing structure.

Background

The foundation pit beam string is an auxiliary component structure used for supporting the side wall of the foundation pit in the foundation pit. In the prior art, the quality of the concrete crown beam or waist beam on a construction site is difficult to guarantee for the beam string of the foundation pit support, the size error is obvious, the connection force transfer between the steel purlin system and the concrete crown beam or waist beam is unclear, the reliability is poor, and potential safety hazards exist. In the prior art, the inclined strut is generally of a concrete structure or a large-sized steel pipe structure, the steel pipe structure is large in size and weight, the requirements on the bearing capacity of a foundation and the performance of hoisting machinery are high, and the cost is high.

It is desirable to provide a bracing structure for beam string to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a bracing structure for a beam string, which comprises a plurality of bracing devices, a plurality of prestress applying devices and a plurality of tensile devices. The bracing device is provided with bracing girder and the linkage unit, and the linkage unit is provided with one with the bracing girder at least. The both ends of bracing girder all are provided with first connecting plate, and the both ends of linkage unit all are provided with the second connecting plate. The diagonal bracing main beams are connected with the connecting units through the first connecting plates and the second connecting plates through bolts, and the connecting units are used for connecting the two adjacent diagonal bracing main beams. The connecting unit and the diagonal bracing girder are provided with a plurality of rib plates which are of right-angled trapezoid structures, and the rib plates are used for strengthening the bearing capacity of the first connecting plate and the second connecting plate. The prestress applying device is arranged at one end of the inclined strut device, and the other end of the prestress applying device is in contact with the bracket and used for enabling the bracing structure of the beam string beam to be connected with the concrete beam in an extrusion mode. One end of the tensile device is connected with the concrete beam, and the other end of the tensile device is connected with the prestress applying device. This beam string bracing structure is formed by a plurality of small-size component concatenations, and is lower to the bearing capacity of ground and the performance requirement of hoist and mount machinery, has improved the efficiency of hoist and mount greatly, has practiced thrift the cost, has solved among the prior art that the bearing capacity of bracing to the ground and the performance requirement of hoist and mount machinery are higher and lead to the higher problem of cost.

In order to solve the above problems, the present invention comprises: the utility model provides a beam string bracing structure for the contained angle department to two adjacent lateral walls of foundation ditch supports, the foundation ditch is provided with the concrete beam, be provided with a plurality of brackets on the concrete beam, it includes:

the inclined strut device is provided with an inclined strut main beam and a connecting unit, and the connecting unit and the inclined strut main beam are at least arranged in one; the two ends of each main diagonal bracing beam are provided with first connecting plates, the two ends of each connecting unit are provided with second connecting plates, and each connecting unit is used for connecting two adjacent main diagonal bracing beams; the main beam of the inclined strut is connected with the connecting unit through the first connecting plate and the second connecting plate through bolts; the connecting unit and the diagonal bracing main beam are both provided with a plurality of rib plates which are in a right-angled trapezoid structure, and the rib plates are used for reinforcing the bearing capacity of the first connecting plate and the second connecting plate;

the prestress applying devices are arranged at one ends of the inclined strut devices, and the other ends of the prestress applying devices are in contact with the brackets and used for enabling the bracing structure of the beam string beam to be in compression connection with the concrete beam; and the number of the first and second groups,

and one end of the tensile device is connected with the concrete beam, and the other end of the tensile device is connected with the prestress applying device.

In the bracing structure for the beam string, the bracing structure for the beam string is obliquely arranged at an angle of 45 degrees with two adjacent concrete beams. The inclined strut structure of the beam string is more reasonable in stress and more economical in material due to the arrangement of 45 degrees.

Furthermore, 1-6 groups of beam string inclined strut structures are arranged at the included angle between two adjacent side walls of the foundation pit. The number of the bracing structures of the beam string is selected according to the field situation, and the supporting effect is improved.

Furthermore, the inclined strut main beam is provided with a plurality of beam main bodies and a plurality of batten plates, the plurality of main body beams are arranged in parallel, the plurality of batten plates are respectively and symmetrically arranged on two sides of the beam main body, and the length directions of the batten plates are perpendicular to the length direction of the beam main body; each batten plate is connected with each beam main body through bolts, and the beam main bodies are connected into a whole through the bolts, so that the mounting efficiency is improved.

Furthermore, each diagonal bracing main beam is provided with 2-6 batten plates, two groups of parallel bolt groups are arranged between each batten plate and each beam main body, and each group of bolt groups is provided with 3-5 bolts.

Furthermore, when the number of the beam main bodies is less than three, two beam main bodies are arranged; when the beam string inclined strut structure is larger than three groups and less than or equal to six groups, the beam main body is set to be three, and the cost is saved.

Further, open string roof beam bracing structure when being greater than three and six groups less than or equal to, open string roof beam bracing structure still is provided with web member and diagonal web member, the web member and diagonal web member is used for connecting adjacent two sets of open string roof beam bracing structure, diagonal web member and two sets of open string roof beam bracing structure slope sets up for improve adjacent two sets of open string roof beam bracing structure's bearing capacity prevents to warp. The web members are perpendicular to the two groups of beam string diagonal bracing structures. The connecting unit still is provided with the tie-beam, the bracing device still is provided with a plurality of first fixed plates and a plurality of third connecting plate, and adjacent two the bracing girder is provided with threely the connecting unit, first be provided with first fixed plate on the connecting unit, the third connecting plate sets up threely on the connecting unit. One end of the diagonal web member is provided with a second fixing plate corresponding to the first fixing plate, and the other end of the diagonal web member is provided with a fourth connecting plate. The third connecting plate is connected with the fourth connecting plate through a pin shaft, and the first fixing plate is connected with the second fixing plate through a bolt; the two ends of the web member are respectively connected with the two connecting beams through bolts, so that the mounting efficiency is improved.

Furthermore, the connecting unit is provided with two first fixing plates which are arranged in a crossed manner, the inclined strut device is further provided with a plurality of fixing blocks, and two ends of the fixing blocks are respectively connected with the first fixing plates and the second fixing plates through bolts, so that the bearing strength of the connecting parts is improved.

Furthermore, an accommodating groove is formed in the middle of the third connecting plate, and one end of the fourth connecting plate is located in the accommodating groove. The midline of the diagonal web member and the midline of the diagonal bracing device are both positioned in the same plane, so that the transmission of force is facilitated.

Further, the overlapped parts of the third connecting plate and the fourth connecting plate are all arranged into a semicircular structure. The occupied space is small, and the third connecting plate and the fourth connecting plate can be hinged conveniently.

Because the utility model adopts the bracing structure of the beam string, compared with the prior art, the utility model has the advantages that: the utility model relates to a bracing structure for a beam string, which comprises a plurality of bracing devices, a plurality of prestress applying devices and a plurality of tensile devices. The bracing device is provided with bracing girder and the linkage unit, and the linkage unit is provided with one with the bracing girder at least. The both ends of bracing girder all are provided with first connecting plate, and the both ends of linkage unit all are provided with the second connecting plate. The diagonal bracing main beams are connected with the connecting units through the first connecting plates and the second connecting plates through bolts, and the connecting units are used for connecting the two adjacent diagonal bracing main beams. The connecting unit and the diagonal bracing girder are provided with a plurality of rib plates which are of right-angled trapezoid structures, and the rib plates are used for strengthening the bearing capacity of the first connecting plate and the second connecting plate. The prestress applying device is arranged at one end of the inclined strut device, and the other end of the prestress applying device is in contact with the bracket and used for enabling the bracing structure of the beam string beam to be connected with the concrete beam in an extrusion mode. One end of the tensile device is connected with the concrete beam, and the other end of the tensile device is connected with the prestress applying device. This beam string bracing structure is formed by a plurality of small-size component concatenations, and is lower to the bearing capacity of ground and the performance requirement of hoist and mount machinery, has improved the efficiency of hoist and mount greatly, has practiced thrift the cost, has solved among the prior art that the bearing capacity of bracing to the ground and the performance requirement of hoist and mount machinery are higher and lead to the higher problem of cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments are briefly introduced below, and the drawings in the following description are only corresponding to some embodiments of the present invention.

Fig. 1 is a schematic structural diagram of an embodiment of a beam string inclined strut structure according to the present invention.

Fig. 2 is a schematic structural diagram of a bracing device of the bracing structure of the beam string according to an embodiment of the present invention.

Fig. 3 is a top view of an embodiment of a main bracing beam of the bracing structure of the beam string structure of the present invention.

Fig. 4 is a schematic cross-sectional view of an embodiment of a main bracing beam of the bracing structure of the beam string structure of the utility model.

Fig. 5 is a schematic plan view of an embodiment of the connecting device of the bracing structure of the beam string of the present invention.

Fig. 6 is a schematic plan view of two embodiments of the connecting device of the bracing structure of the beam string of the present invention.

In the figure: 10. the tension string beam diagonal bracing structure comprises a tension string beam diagonal bracing structure, 20 diagonal bracing devices, 21 diagonal bracing main beams, 211 beam main bodies, 212 batten plates, 213 ribbed plates, 214 first connecting plates, 215 bolts, 22 connecting units, 221 second connecting plates, 222 connecting beams, 23 first fixing plates, 23 third connecting plates, 30 web members, 40 diagonal web members, 41 second fixing plates, 42 fourth connecting plates, 50 prestress applying devices, 60 tensile devices, 70 concrete beams and 71 corbels.

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.

The directional terms used in the present invention include, for example, up, down, front, rear, left, right, left, right, left, right, left, right, left, right, left, right, left, right,

The terms "left", "right", "inside", "outside", "side", "top" and "bottom" refer to the orientation of the drawings, and the directional terms are used for illustration and understanding of the utility model, and are not intended to limit the utility model.

In the drawings, elements having similar structures are denoted by the same reference numerals.

Referring to fig. 1, in the present embodiment, the beam string bracing structure 10 is used for supporting an included angle between two adjacent side walls of a foundation pit, the foundation pit is provided with a concrete beam 70, and the concrete beam 70 is provided with a plurality of brackets 71. And 1-6 groups of beam string inclined strut structures 10 are arranged at the included angle of two adjacent side walls of the foundation pit. The number of the bracing structures 10 of the beam string is selected according to the field situation, so that the supporting effect is improved. The beam string bracing structure 10 is arranged at an angle of 45 ° to the adjacent two concrete beams 70. The 45-degree arrangement enables the stress of the beam string inclined strut structure 10 to be more reasonable, and the materials are more economical. The bracing structure 10 includes a plurality of bracing devices 20, a plurality of prestressing devices 50, and a plurality of tensile devices 60.

In the present embodiment, referring to fig. 1 and fig. 2, the inclined strut device 20 is provided with an inclined strut main beam 21 and a connection unit 22, and at least one of the connection unit 22 and the inclined strut main beam 21 is provided. Referring to fig. 3 and 4, the main diagonal member 21 includes a plurality of member bodies 211 and a plurality of gusset plates 212, and the plurality of member bodies 211 are disposed in parallel. When the bracing structure 10 of the beam string is smaller than three groups, two beam main bodies 211 are provided; when the beam string inclined strut structure 10 is more than three sets and less than or equal to six sets, the beam main body 211 is provided with three, which saves cost while ensuring sufficient supporting force. Each main diagonal bracing beam 21 is provided with 2-6 gusset plates 212, two groups of parallel bolt groups are arranged between each gusset plate 212 and each beam main body 211, and each group of bolt groups is provided with 3-5 bolts 215. The gusset plates 212 are symmetrically disposed on both sides of the beam body 211, respectively, and the length direction of the gusset plates 212 is perpendicular to the length direction of the beam body 211. Each gusset plate 212 is connected with each beam main body 211 through bolts, so that the beam main bodies 211 are connected into a whole, and the mounting efficiency is improved. Both ends of bracing girder 21 all are provided with first connecting plate 214, and the both ends of connecting element 22 all are provided with second connecting plate 221, and connecting element 22 is used for connecting two adjacent bracing girders 21. The main diagonal bracing beams 21 and the connecting units 22 are connected through bolts with the first connecting plate 214 and the second connecting plate 221. The connecting unit 22 and the diagonal bracing girder 21 are both provided with a plurality of rib plates 213, the rib plates 213 are arranged in a right-angled trapezoid structure, and the rib plates 213 are used for enhancing the bearing capacity of the first connecting plate 214 and the second connecting plate 221.

A prestress applying device 50 is provided between the bracing device 20 and the corbel 71 for press-connecting the beam string bracing structure 10 and the concrete beam 70. Each prestress applying unit 50 is provided with two tensile units 60, one end of each tensile unit 60 is connected to the concrete beam 70, and the other end of each tensile unit 60 is connected to the prestress applying unit 50.

In this embodiment, referring to fig. 2, fig. 5 and fig. 6, when the bracing structure 10 of the beam string is greater than three sets and less than or equal to six sets, the bracing structure 10 of the beam string is further provided with web members 30 and diagonal web members 4030. The web members 30 and the diagonal web members 4030 are used for connecting two adjacent groups of beam string diagonal bracing structures 10, and the diagonal web members 4030 and the two groups of beam string diagonal bracing structures 10 are obliquely arranged, so that the bearing capacity of the two adjacent groups of beam string diagonal bracing structures 10 is improved, and deformation is prevented. The web member 30 is perpendicular to the two groups of beam string inclined strut structures 10, and two ends of the web member 30 are respectively connected with the two connecting beams 222 through bolts, so that the installation efficiency is improved. The connection unit 22 is further provided with a connection beam 222, and the inclined strut device 20 is further provided with a plurality of first fixing plates 23 and a plurality of third connection plates 23, wherein the plurality of first fixing plates 23 are arranged in a crossing manner. Two adjacent bracing main beams 21 are provided with three connecting units 22, the first connecting unit 22 is provided with two first fixing plates 23, the third connecting plate 23 is arranged on the third connecting unit 22, and the middle connecting unit 22 is only provided with one connecting beam 222, so that the cost can be saved. One end of the diagonal web 4030 is provided with a second fixing plate 41 corresponding to the first fixing plate 23, and the other end of the diagonal web 4030 is provided with a fourth connecting plate 42. The overlapping portions of the third connecting plate 23 and the fourth connecting plate 42 are all configured in a semicircular structure. The occupied space is small, and the third connecting plate 23 and the fourth connecting plate 42 can be conveniently hinged. An accommodating groove is formed in the middle of the third connecting plate 23, and one end of the fourth connecting plate 42 is located in the accommodating groove. The third connecting plate 23 is pin-connected with the fourth connecting plate 42, so that the central line of the diagonal web 4030 and the central line of the diagonal bracing device 20 are both located in the same plane, and the transmission of force is facilitated. The inclined strut device 20 is further provided with a plurality of fixing blocks, and two ends of each fixing block are respectively in bolted connection with the first fixing plate 23 and the second fixing plate 41, so that the bearing strength of the connecting part is improved.

The installation process of the bracing structure 10 of the beam string of the utility model is as follows:

first, preparation work before installation

Firstly, the construction machines, materials, constructors, water for field construction and electricity utilization are confirmed to be in place. The steel member of the beam string bracing structure 10 is manufactured by a factory of a professional manufacturer, and the member leaves the factory and has a factory qualification certificate and is sampled and detected according to design requirements. The field assembly construction of the beam string diagonal bracing structure 10 is performed by a company specially performing the research and development of building materials such as steel bracing and the like.

Next, the construction environment is confirmed. The area of the outer contour line range of the beam string bracing structure 10 is extended by one meter, and the earthwork needs to be excavated to 1.5 meters below the bottom surface of the concrete beam 70, so that the beam string bracing structure is convenient to be directly braced and installed. Over excavation is strictly prohibited so as to avoid causing safety accidents of the foundation pit. The hoisting site and the approach road require flat sites and are compacted by a road roller of more than 15T, and the running requirement of 40T heavy vehicles is ensured. After the site excavation meets the conditions, paying off and positioning the positions of the connecting piece and the support platform beam according to a drawing, positioning and welding the connecting piece between the embedded part and the platform beam at the moment, wherein the welding requirements are detailed in a construction drawing, and the beam, the stand column and the connecting piece are all connected by high-strength bolts. During installation, the elevation of the top of the platform beam is controlled to be consistent with the design construction drawing, and the error is controlled within +/-2 mm. The support platform beam is used to support the various components of the beam string sprag structure 10.

Then, the mounting position of the bracing structure 10 for the beam string is set out.

Second, hoisting operation

The main beam 21 and the connecting unit 22 of the inclined strut are assembled in sections outside the field, the length of each section is not more than 13 meters, and the weight of each section is not more than 10.5T. The plurality of beam bodies 211 are disposed in parallel, and the gusset plates 212 are disposed at corresponding mounting positions and are connected by bolts. And butting the first connecting plate 214 of the spliced main diagonal bracing beam 21 with the second connecting plate 221 butted with the connecting unit 22 by using bolts.

When the tension string beam diagonal bracing structures 10 are more than three groups and less than or equal to six groups, the two groups of tension string beam diagonal bracing structures 10 which are adjacently installed are assembled together with the web members 30 and the diagonal web members 4030 in sections. The main bracing beam 21 and the connecting unit 22 are installed first, and then the web member 30 and the diagonal web member 4030 are installed.

Transporting the segmented component to the site; and hoisting the segmented component to the corresponding position on the bracket platform on site for installation. And the hoisting accounting is required before hoisting, so that the hoisting safety is ensured.

Third, field installation

Sequentially hanging the members assembled by sections of the beam string inclined strut structure 10 on the platform beam, wherein two adjacent sectional members are connected by bolts. The related art rechecks whether the installation accuracy of the bracing device 20 meets the design requirements by installing the prestress applying device 50 and the tensile device 60.

The bolt 215 adopts a high-strength bolt 215, the high-strength bolt 215 can be smoothly inserted into the hole, and the high-strength bolt 215 can meet the national standard requirement, can not be forcibly knocked, has consistent insertion direction and is convenient to operate. The tightening sequence of each set of bolts 215 should be from the center of the node to the edge, and the exposed part of the bolts 215 should be no less than two threads when the bolts 215 installed on the day should be completely tightened in the end of the day. After the installation, paint is applied to the part where the paint is locally damaged by collision, and the high-strength bolt 215 is screwed down and is coated with the anti-corrosion paint.

The allowable deviation of the steel support installation is in accordance with:

a. the offset of the steel support center line to the positioning axis is 5 mm;

b. elevation is-8 mm and +5 mm;

c. deflection rise deviation 12 mm;

four, two times grouting

After the beam string bracing structure 10 is installed, the gap between the end of the bracing device 20 and the concrete beam 70 is determined whether grouting is performed according to the on-site flatness and the bracing dismantling requirement, and grouting at least one end is ensured. The field grouting adopts high-strength non-shrinkage grouting material.

1. Treatment of contact surfaces

Sundries on the contact surface of the cleaning concrete beam 70 are watered and moistened.

2. Supporting formwork

The positioning elevation of the template is at least 50mm higher than the upper surface of the side seat of the steel member, and the template must be tightly and stably erected to prevent loosening and slurry leakage.

3. Stirring of grouting material

The water adding amount is determined according to the water-material ratio on the product qualification certificate, and the mixture is stirred for 2 minutes manually.

4. Grouting requirements

a) The grouting must be carried out continuously without interruption, and the grouting time should be shortened as much as possible;

b) when the volume is larger, stones with the diameter of 0.5mm can be added according to the ratio of 1:1 when the grouting material is stirred;

c) the template is kept and not removed, and the grouting layer is prohibited from being vibrated and collided;

d) and immediately watering, moisturizing and maintaining after the grouting layer is finally set.

Prestressing force application of hydraulic jack

1. Preparation before application

1) A hydraulic jack STQ200T/100mm and an electric oil pump DZB1.5KW.

2) The application points are prepared for power wiring in the field.

3) Steel wedges, steel rulers, thin steel plates, steel plates and the like are prepared to ensure that the jack is tightly extruded with the concrete beam 70.

4) The secondary grouting reaches the same strength of C20 concrete.

2. Application of prestressing force

According to the requirements on the design drawing, the prestress applying device 50 at the end point of the inclined strut device 20 applies prestress to the component, so that the prestress at the position reaches the design value. Then moving to the other end of the bracing device 20 to apply the prestress of the component, so that the prestress of the component reaches the design value.

Sixth, monitoring foundation pit

And (4) laying internal force monitoring control points according to a design drawing, monitoring the displacement change of the foundation pit in real time in the construction process, and ensuring that the maximum displacement of the foundation pit is within a range of 30mm in the construction process. The monitoring requirements, early warning and response measures are as follows:

1. before the construction of the foundation pit engineering, a third party unit with professional qualification is entrusted to carry out on-site monitoring on the foundation pit engineering, the monitoring unit is required to compile a monitoring scheme, the monitoring scheme is approved by a construction party, a design party, a supervision party and the like, can be implemented by a rear party together with a special construction scheme through expert demonstration, and can be implemented by a rear party after negotiation with related management units related to the surrounding environment of the foundation pit is consistent if necessary.

2. Inspecting by patrol: in the construction and service life of the foundation pit engineering, a specially-assigned person needs to perform patrol inspection and record every day, the patrol inspection is mainly performed by visual inspection, and tools such as hammers, drills, measuring rulers and magnifying glasses and equipment such as camera shooting and photographing can be supplemented. The checking content comprises the following steps:

1) supporting construction: the forming quality of the supporting structure; the supporting structure has no large deformation; whether the soil body behind the wall has cracks, subsidence and slippage or not; the foundation pit has no soil gushing, sand flowing and piping.

2) Construction working conditions are as follows: the exposed soil condition after excavation is different from a rock and soil investigation report; whether the length and the layered thickness of the excavation sections of the foundation pit are consistent with the design requirements or not; whether the discharge conditions of surface water and underground water of the site are normal or not; and (4) whether the ground around the foundation pit is overloaded or not.

3) Ambient environment: whether the peripheral pipeline is damaged or not or the peripheral pipeline leaks or not; whether new cracks appear in the peripheral buildings or not; whether cracks and subsidence exist on the peripheral road (ground); the construction change condition of the adjacent foundation pit and the building.

4) Monitoring facilities: the integrity of the reference point and the monitoring point; monitoring the integrity and protection condition of the element; there are obstacles that affect the observation work.

3. When the early warning value appears or the following situations appear, the pit monitoring system immediately gives a danger alarm and takes emergency measures for protective objects of a supporting structure and the surrounding environment:

1) monitoring data reaches 80% of a monitoring alarm value;

2) the displacement value of a foundation pit supporting structure or a peripheral soil body is suddenly and obviously increased, or quicksand, piping, swelling, collapse, serious leakage and the like appear in the foundation pit;

3) the peripheral ground has more serious sudden cracks or deformation cracks which harm the structure;

4) judging according to local engineering experience that other situations which need to be subjected to danger alarm occur;

5) the deformation of the peripheral pipeline suddenly and obviously grows or cracks, leakage and the like occur.

After the beam string bracing structure 10 is put into use, secondary prestress application is performed according to the design requirement immediately according to the displacement change of the foundation pit according to the monitoring result of a third party, and the prestress is ensured to be in the designed range.

Seven, tear open and prop up

On the basis of fully understanding the design drawing, according to the characteristics of the engineering, the construction strength of the company, the construction experience of completing similar engineering, the technology, the matching capacity of machines and tools and equipment and other factors are combined, and the principle of safety, reliability, economy and applicability is followed.

1. Stripping strip

After the construction of the basement top plate floor is finished and the rigidity can be provided, the support replacement work is started, and the support can be detached after the construction and maintenance of the force body to be transmitted are finished to meet the design requirements. During dismantling, special attention needs to be paid to ensure safe unloading of the axial force, and negative effects of sudden stress changes on the enclosure structure and the main structure are avoided. In addition, safety and quality accidents caused by falling of the steel support in the lifting process are avoided.

Comprehensively considering, the steel support dismantling needs to meet the following conditions:

1) and the support replacing component reaches the strength required by the design, and the steel support can be detached.

2) Receiving a steel support dismantling notice or a related written document;

3) the construction operation surface and the channel for dismantling the steel support are provided.

2. Dismantling of beam string inclined strut structure 10

1) Cleaning and leveling the crane stopping place. And (4) according to the construction organization plan, making the on-site tee joint work on the same level. The method is characterized in that stones and steel plates need to be laid in advance on a route, a road surface and a soft soil road surface before a crane enters a field, so that delay is avoided.

2) And chiseling the secondary grouting layer on one side of the support, and releasing the internal force of the steel support.

3) And (3) dismantling the lighter small components such as the web member 30, the inclined web member 4030 and the like by using a tower crane, and loading and transporting by using a 16-ton crane. Then, large components such as the diagonal bracing main beam 21 and the connecting unit 22 are removed, and the components are loaded and transported by a 16-ton crane.

4) And (4) unfastening the support bolt 215, hoisting the support member to a member concentration area through a tower crane, and carrying out loading by adopting a 16-ton crane.

In this embodiment, the present invention relates to a bracing structure for a beam string, which includes a plurality of bracing devices, a plurality of prestress applying devices, and a plurality of tensile devices. The bracing device is provided with bracing girder and the linkage unit, and the linkage unit is provided with one with the bracing girder at least. The both ends of bracing girder all are provided with first connecting plate, and the both ends of linkage unit all are provided with the second connecting plate. The diagonal bracing main beams are connected with the connecting units through the first connecting plates and the second connecting plates through bolts, and the connecting units are used for connecting the two adjacent diagonal bracing main beams. The connecting unit and the diagonal bracing girder are provided with a plurality of rib plates which are of right-angled trapezoid structures, and the rib plates are used for strengthening the bearing capacity of the first connecting plate and the second connecting plate. The prestress applying device is arranged at one end of the inclined strut device, and the other end of the prestress applying device is in contact with the bracket and used for enabling the bracing structure of the beam string beam to be connected with the concrete beam in an extrusion mode. One end of the tensile device is connected with the concrete beam, and the other end of the tensile device is connected with the prestress applying device. This beam string bracing structure is formed by a plurality of small-size component concatenations, and is lower to the bearing capacity of ground and the performance requirement of hoist and mount machinery, has improved the efficiency of hoist and mount greatly, has practiced thrift the cost, has solved among the prior art that the bearing capacity of bracing to the ground and the performance requirement of hoist and mount machinery are higher and lead to the higher problem of cost.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims (10)

1. The utility model provides a stretch out string roof beam bracing structure for the contained angle department to two adjacent lateral walls of foundation ditch supports, the foundation ditch is provided with the concrete beam, be provided with a plurality of brackets on the concrete beam, a serial communication port, include:

the inclined strut device is provided with an inclined strut main beam and a connecting unit, and the connecting unit and the inclined strut main beam are at least arranged in one; the two ends of each main diagonal bracing beam are provided with first connecting plates, the two ends of each connecting unit are provided with second connecting plates, and each connecting unit is used for connecting two adjacent main diagonal bracing beams; the main beam of the inclined strut is connected with the connecting unit through the first connecting plate and the second connecting plate through bolts; the connecting unit and the diagonal bracing main beam are both provided with a plurality of rib plates which are in a right-angled trapezoid structure, and the rib plates are used for reinforcing the bearing capacity of the first connecting plate and the second connecting plate;

the prestress applying devices are arranged at one ends of the inclined strut devices, and the other ends of the prestress applying devices are in contact with the brackets and used for enabling the bracing structure of the beam string beam to be in compression connection with the concrete beam; and the number of the first and second groups,

and one end of the tensile device is connected with the concrete beam, and the other end of the tensile device is connected with the prestress applying device.

2. A beam string bracing structure according to claim 1, wherein the beam string bracing structure is arranged at an inclination of 45 ° to two adjacent concrete beams.

3. A beam string bracing structure according to claim 1, wherein 1-6 groups of the beam string bracing structure are arranged at the included angle between two adjacent side walls of the foundation pit.

4. The tension string beam sprag structure according to claim 1, wherein the sprag main beam is provided with a plurality of beam main bodies and a plurality of batten plates, the plurality of beam main bodies are arranged in parallel, the plurality of batten plates are respectively symmetrically arranged on both sides of the beam main body, and the length direction of the batten plates is perpendicular to the length direction of the beam main body; each batten plate is connected with each beam main body through bolts, and the batten plates are used for connecting the beam main bodies into a whole.

5. A beam string bracing structure according to claim 4, wherein each main beam bracing beam is provided with 2-6 gusset plates, two parallel bolt sets are provided between each gusset plate and each beam main body, and each bolt set is provided with 3-5 bolts.

6. The beam string bracing structure according to claim 4, wherein when the beam string bracing structure is smaller than three groups, the beam main bodies are provided in two; when the beam string inclined strut structure is more than three groups and less than or equal to six groups, the beam main bodies are three.

7. The beam string bracing structure according to claim 6, wherein when the beam string bracing structure is larger than three sets and less than or equal to six sets, the beam string bracing structure is further provided with web members and diagonal web members, the web members and the diagonal web members are used for connecting two adjacent sets of the beam string bracing structures, and the diagonal web members are obliquely arranged with the two sets of the beam string bracing structures; the web members are perpendicular to the two groups of beam string diagonal bracing structures; the connecting units are also provided with connecting beams, the inclined strut device is also provided with a plurality of first fixing plates and a plurality of third connecting plates, three connecting units are arranged on two adjacent inclined strut main beams, a first fixing plate is arranged on the first connecting unit, and the third connecting plate is arranged on the third connecting unit; a second fixing plate corresponding to the first fixing plate is arranged at one end of the inclined web member, and a fourth connecting plate is arranged at the other end of the inclined web member; the third connecting plate is connected with the fourth connecting plate through a pin shaft, and the first fixing plate is connected with the second fixing plate through a bolt; and two ends of the web member are respectively connected with the two connecting beams through bolts.

8. A beam string bracing structure according to claim 7, wherein said connection unit is provided with two said first fixing plates, said two said first fixing plates are arranged crosswise, said bracing device is further provided with a plurality of fixing blocks, two ends of said fixing blocks are respectively bolted to said first fixing plate and said second fixing plate.

9. A beam string bracing structure according to claim 7, wherein a receiving groove is provided in the middle of said third connecting plate, and one end of said fourth connecting plate is located in said receiving groove.

10. A beam string bracing structure according to claim 7, wherein the overlapping portions of the third connecting plate and the fourth connecting plate are each provided in a semicircular configuration.

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