CN110409463B

CN110409463B - Construction method for convenient disassembly and assembly of foundation pit support and foundation pit support structure thereof

Info

Publication number: CN110409463B
Application number: CN201910742341.9A
Authority: CN
Inventors: 杨有莲
Original assignee: Chengdu University
Current assignee: Chengdu University
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2020-07-21
Anticipated expiration: 2039-08-13
Also published as: CN110409463A

Abstract

The embodiment of the invention discloses a convenient dismounting construction method for a foundation pit support and a foundation pit support structure, which comprise an attached pile, wherein side pressure devices are fixedly arranged at the top of the attached pile, support main beams are arranged on the side pressure devices through locking bases, support cantilevers are arranged on two sides of each locking base, a frame protection rod is arranged at the tail end of each support cantilever, a support protection plate is arranged on each support main beam through a fixing bolt, two ends of each support protection plate are connected with the frame protection rods through hasps, a plurality of anchoring pile positions are uniformly arranged on each support protection plate, and each anchoring pile position is provided with one anchoring pile; the invention improves the anchoring capability on the whole plane and further improves the supporting effect by arranging the pre-arranged supporting structure and the flexible supporting plate on the basis of the structure and flexibly arranging the anchoring pile on the core supporting structure, and the supporting structure is flexible and variable and can be conveniently disassembled and assembled at any time according to the construction requirement.

Description

Construction method for convenient disassembly and assembly of foundation pit support and foundation pit support structure thereof

Technical Field

The embodiment of the invention relates to the technical field of foundation pit supporting, in particular to a construction method for conveniently disassembling and assembling a foundation pit supporting and a foundation pit supporting structure thereof.

Background

With the continuous development of infrastructure construction, high-rise and high-quality buildings are increased gradually, and for the large buildings, the foundation pit of the large buildings is inevitably larger and deeper to ensure the construction quality. For large and deep foundation pits, the construction of the supporting structure of the foundation pit becomes more and more difficult, and simultaneously, new requirements are put forward on the supporting performance of the supporting structure.

In the building construction process, in order to ensure the construction of an underground structure and the safety and the convenience of the surrounding environment of the deep foundation pit, the measures of supporting and reinforcing the side wall of the deep foundation pit and the surrounding environment must be taken, and the method is particularly important for the dense building areas on the soft soil foundation.

For general foundation pit supporting, a bored pile is generally adopted, a horizontal reinforced concrete support is arranged in a pit, the rigidity and stability of a foundation pit support structure are improved, the deformation of the foundation pit is well controlled, but the supporting structure is usually directly arranged on the side wall of the foundation pit or inside the foundation pit, the large-scale reinforced concrete support is inconvenient to construct and maintain, particularly the construction period of the foundation pit is prolonged by replacing the support and removing the support, the supporting structure of the type needs to remove the originally arranged supporting structure for the extension and the reconstruction of the foundation pit, and a new supporting device is built in the same mode, so that the construction period is prolonged, the construction cost is improved, and the inconvenience is brought to basement construction.

Along with the extension of capital construction engineering, a new requirement is provided for the flexibility of a foundation pit supporting device, in the existing foundation pit supporting, the supporting structure is fixed, if the supporting structure is changed, the reconstruction of the foundation pit needs to be greatly changed, even the whole foundation pit needs to be pushed to be reworked, and for the existing foundation pit, the engineering quantity is overlarge, the cost is high, and the construction period is prolonged.

Disclosure of Invention

Therefore, the embodiment of the invention provides a construction method for conveniently disassembling and assembling a foundation pit support and a foundation pit support structure thereof, which aim to solve the problem that the reliability and flexibility of a foundation pit support system in the prior art are insufficient.

In order to achieve the above object, an embodiment of the present invention provides the following:

a foundation pit supporting structure comprises a plurality of attached piles anchored on two sides of a foundation pit, wherein side pressure devices are fixedly mounted at the tops of the attached piles, supporting main beams are mounted on the side pressure devices through locking bases, supporting cantilevers are arranged on two sides of each locking base, and frame protection rods are arranged at the tail ends of the supporting cantilevers;

the supporting and protecting device is characterized in that a supporting and protecting plate is mounted on the supporting and protecting girder through a fixing bolt, two ends of the supporting and protecting plate are connected with a frame protecting rod through hasps, a plurality of anchoring pile positions are evenly arranged on the supporting and protecting plate, and each anchoring pile position is provided with an anchoring pile.

As a preferable scheme of the invention, the attachment pile comprises a temporary enclosure plate arranged on the side wall of the foundation pit, a grouting channel is arranged in the side wall of the foundation pit and penetrates through the temporary enclosure plate, a perforation channel is arranged in the grouting channel in the direction vertical to the channel, a plurality of diameter-expanding attachment heads are arranged on the grouting channel, an anchor bar is arranged in the grouting channel, an anchor plate is arranged at the bottom of the anchor bar, and an anchorage device is fixedly arranged at the outer end of the anchor bar.

As a preferable scheme of the invention, an included angle between the grouting channel and a horizontal plane is 10-30 degrees.

As a preferred scheme of the invention, the side pressure device comprises a pressure-bearing steel ingot of which the side edge is hinged with the anchorage device, a fine adjustment support rod is fixedly arranged on the other side of the pressure-bearing steel ingot, and the other end of the fine adjustment support rod is arranged in a pressure-bearing hole of the anchorage device.

As a preferable scheme of the invention, the supporting cantilever comprises a supporting short arm which is embedded in the locking base, a plurality of supporting sections are sequentially arranged outside the supporting short arm through a telescopic adjusting device, a mounting seat is arranged on the supporting section at the last position, and a frame protection rod is arranged on the mounting seat in the same column.

As a preferable scheme of the present invention, the telescopic adjusting device includes a telescopic base rod which is embedded in a positioning groove provided on the short supporting arm or the supporting section, the telescopic base rod and the positioning groove are respectively provided with progressive threads which are engaged with each other, the other end of the telescopic base rod is fixedly provided with a load flat plate, the surface of the load flat plate is provided with a bearing platform which is closed with the supporting section, and the other surface of the bearing platform is provided with a plurality of auxiliary supporting rods.

As a preferred scheme of the invention, the locking base comprises a fastening base buckled with the pressure-bearing steel ingot, a pressure-bearing supporting plate is fixedly mounted on the upper surface of the fastening base, a limiting groove is formed in the pressure-bearing supporting plate, a containing cavity is formed between the fastening base and the pressure-bearing supporting plate, a transverse main beam channel is arranged in the containing cavity, a vertical supporting channel is arranged on the same plane of the main beam channel, and a pulling buckle is fixedly mounted at the end opening of the containing cavity.

In addition, the invention also provides a construction method for conveniently dismounting and mounting the foundation pit support, which comprises the following steps:

step 100, arranging a temporary enclosure plate on the side wall of an excavated foundation pit;

step 200, excavating a grouting channel on the side wall of the foundation pit through a drilling device, and performing high-pressure grouting after an anchoring device is arranged in the grouting channel;

step 300, carrying out horizontal calibration on the anchoring device, arranging a supporting main beam, and arranging a supporting plate on the supporting main beam in a movable connection manner;

and step 400, carrying out auxiliary support on the supporting plate.

As a preferred aspect of the present invention, in step 200, a specific installation method of the anchoring device is as follows:

step 201, forming a perforation channel vertical to a grouting channel in the grouting channel through a perforation device, and blasting at equal intervals in the grouting channel to form an expanded diameter attachment head;

step 202, removing dregs generated by perforation and blasting, sequentially arranging anchoring devices in the grouting channel, and arranging a reducer and an anchor ingot plate in the diameter-expanding attachment head;

and 203, injecting concrete through high-pressure grouting after the anchoring device is arranged, and increasing grouting pressure after grouting to maintain the increased grouting pressure.

As a preferable scheme of the present invention, in step 300 and step 400, the supporting method of the supporting plate specifically includes:

installing a support main beam, installing a support cantilever by taking the locking base as the center, and arranging a frame protection rod through the support cantilever;

mounting a supporting and protecting plate through a supporting main beam and a frame protecting rod;

and arranging anchoring piles according to requirements through the anchoring pile positions on the supporting plate.

The embodiment of the invention has the following advantages:

(1) the most basic supporting structure is preset, the defects in the prior art are overcome, double supporting is achieved by combining grouting inside the foundation pit and external supporting, the formed multiple supporting structure can reinforce the foundation pit and support the foundation pit again, the stability of the supporting is improved, collapse of the foundation pit is fundamentally avoided, and therefore the safety of foundation pit construction is guaranteed;

(2) on the basis of eliminating the shearing force applied to the supporting structure, the whole supporting system is fixed in a movable connection mode, so that the whole supporting structure is stable and reliable, and meanwhile, the supporting structure is movably connected, so that the supporting structure is convenient to disassemble and assemble.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

FIG. 1 is a schematic diagram of a supporting plate structure according to an embodiment of the present invention;

FIG. 2 is a schematic view of an embodiment of an attachment pile of the present invention;

FIG. 3 is a schematic structural view of a lateral pressing device according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a latch base according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a telescopic adjustment device according to an embodiment of the present invention;

FIG. 6 is a schematic flow chart of an embodiment of the present invention.

In the figure: 1-attaching a pile; 2-a lateral pressure device; 3-supporting the main beam; 4-supporting the guard plate; 5-a locking base; 6-supporting the cantilever; 7-support guard bar;

101-temporary containment sheets; 102-a grouting channel; 103-a perforation channel; 104-expanding the attachment head; 105-an anchor; 106-anchor plate; 107-anchor bars;

201-pressure-bearing steel ingot; 202-fine tuning the support bar;

401-a hasp; 402-anchoring pile position; 403-anchoring piles;

501-fastening a base; 502-pressure bearing pallet; 503-a limit groove; 504-a containment chamber; 505-main beam passage; 506-supporting the channel; 507-pulling out the button;

601-supporting a short arm; 602-a telescopic adjustment device; 603-support section; 604-a mounting seat; 605-a telescoping base rod; 606-a load plate; 607-a carrier table; 608-auxiliary support bar.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 6, the invention provides a construction method for convenient disassembly and assembly of a foundation pit support, which comprises the following steps:

and step 100, arranging a temporary enclosure plate on the side wall of the excavated foundation pit.

The step is to carry out simple temporary support to the floating soil and the like on the side wall of the foundation pit, avoid the influence of the floating soil and the muck generated by vibration in the construction process on the construction, effectively avoid the collapse of the foundation pit in the construction process, and provide simple protection for the foundation pit before a complete support system is not formed.

The temporary enclosure plate can be fixed and supported directly by a scaffold, a complex structure is not needed for supporting, and the scaffold is used for supporting. Thus, to achieve this function, a number of fenders may be provided on the scaffolding used to support the temporary containment sheets.

And 200, excavating a grouting channel on the side wall of the foundation pit through a drilling device, and performing high-pressure grouting after an anchoring device is arranged in the grouting channel.

As mentioned above, the grouting channel and the perforation channel are formed on the side wall of the foundation pit in sequence, the anchoring is performed after the corresponding channels are formed, and the high-pressure grouting is performed after the anchoring, wherein the high-pressure grouting mode is described in detail in the foregoing, and is not described herein again.

In the above, the specific installation method of the anchoring device is as follows:

step 201, forming a perforation channel vertical to a grouting channel in the grouting channel through a perforation device, and blasting at equal intervals on the grouting channel to form an expanding attachment head, wherein the blasting mode adopts directional blasting, and the dosage is determined according to the original consolidation degree of foundation pit soil;

In the reinforcing method, the penetration of concrete is promoted by maintaining the subsequent grouting pressure so as to form a complete and permanent supporting system inside the foundation pit, so that the safety and reliability of the supporting of the foundation pit system can be still ensured even if the supporting system at the periphery of the foundation pit is removed in the subsequent construction, which is a great characteristic of the reinforcing and supporting method.

And 300, horizontally calibrating the anchoring device, arranging a supporting main beam, and arranging a supporting plate on the supporting main beam in a movable connection mode.

And step 400, carrying out auxiliary support on the supporting plate.

In step 300 and step 400, the supporting method of the supporting plate specifically comprises:

In summary, the supporting structure provided in the invention has the following two aspects:

firstly, the defects in the prior art are overcome, double support is achieved by adopting a mode of combining grouting net formation in foundation pit grouting and external support, and the formed multiple support structure can support the foundation pit again while reinforcing the foundation pit, so that the stability of the support is improved, the collapse of the foundation pit is fundamentally avoided, and the safety of foundation pit construction is guaranteed;

secondly, on the basis of eliminating the shearing force applied to the supporting structure, the whole supporting system is fixed in a movable connection mode (or in a bolt connection mode in an auxiliary mode), so that the whole supporting structure is stable and reliable, and meanwhile, the supporting structure is convenient to disassemble and assemble due to the movable connection mode.

Based on the second point, although the supporting main boards are assembled in a movable mode, according to mechanical characteristics, the attachment structures are arranged on the peripheries of the supporting main boards and matched with anchoring shapes, the supporting main boards are arranged in a three-dimensional fixed structure, and the stability of the supporting structure is ensured in a mechanical extrusion mode, so that the supporting structure has super-strong supporting capacity after forming a complete structure, and meanwhile, the supporting structure can be quickly and conveniently disassembled as long as the stress balance of the supporting structure is broken during disassembly.

In addition, as shown in fig. 1 to 5, the invention also provides a foundation pit supporting structure, which comprises a plurality of attached piles 1 anchored on two sides of the foundation pit, and side pressure devices 2 are fixedly arranged on the tops of the attached piles 1.

In the invention, the attached pile 1 is a main stress device of a foundation pit supporting system, and the attached pile mainly works on the principle that the attached pile extends into the side wall of a foundation pit and is stably fixed on the side wall of the foundation pit through the concrete pouring and the anchoring action of reinforcing steel bars.

In the present embodiment, the setting of the attachment pile 1 includes two considerations, the first being to emphasize the strength of its attachment and to be able to support the entire support system; and the second is that the adjustment can be flexibly adjusted by matching with the construction of a foundation pit. From the two aspects, the attachment pile in the invention comprises the characteristics of the two aspects, can go deep into the side wall of the whole foundation pit corresponding to the first point, needs to modify the original side wall of the foundation pit in order to improve the attachment effect, and is in a radial shape corresponding to the second point within the range needing to be adjusted so as to be adjusted.

In order to achieve the above technical effects, in the present embodiment, the attaching pile 1 is specifically constructed as follows:

firstly, a temporary enclosure plate 101 is arranged on the side wall of a foundation pit, the side wall of the foundation pit is coated under the action of the temporary enclosure plate 101, collapse of the side wall of the foundation pit in the construction process is avoided, and the stability and reliability of the construction of a support system are improved. Therefore, the temporary containment plate 101 also belongs to a part of the attachment pile 1, and it should be further explained that, in the present invention, the temporary containment plate 101 only needs to support the side wall of the foundation pit, and the specific shape and the supporting manner thereof are not specifically limited.

And secondly, as a conventional mode, after the temporary enclosure plate 101 is set up, penetrating through the temporary enclosure plate 101, forming a grouting channel 102 in the side wall of the foundation pit, forming a perforation channel 103 in the grouting channel 102 in a direction vertical to the channel, and forming a plurality of expanding attachment heads 104 on the grouting channel 102.

In the prior art, after a grouting channel is usually set up, anchoring components such as reinforcing steel bars and the like are fixed on the side wall of a foundation pit in a grouting mode, so that a complete fixing effect is achieved.

However, in the present invention, because the foundation pit environment to be supported is variable, such as the support of a weak layer, for this type of foundation pit, if the dot-shaped support in the prior art is adopted in the supporting process, the strength of the support may not meet the design requirement.

In the present embodiment, in order to overcome the above problem, an angle between the grouting channel 102 and a horizontal plane is set to 10 to 30 °, and a contact area between the grouting channel 102 and an inner wall of the foundation pit is enlarged. In addition, on the basis, the side wall of the foundation pit is reinforced based on the perforation technology, but the reinforcing mode is different from the conventional grouting mode, the conventional grouting mode is to press in special liquid through pressure so as to strengthen the firmness degree of the side wall of the foundation pit, but the pressing mode is not directional, and the requirement on flexibility cannot be met for the foundation pit support in the embodiment.

In the invention, on the basis of the perforation technology, the ray-shaped perforation channel 103 is formed in the side wall of the foundation pit in a perforation mode based on the prior art, so that a plane parallel to the side wall of the foundation pit is constructed, grouting is carried out in a grouting mode, and an orderly and controllable grouting surface can be formed in the foundation pit.

In order to achieve a better foundation pit attachment effect, the number of the grouting surfaces is determined according to the soil strength of the foundation pit, when the foundation pit is located in a soft layer such as a sandy layer, the number of the grouting surfaces is not less than 5, the distance between every two adjacent grouting surfaces is not less than 50 cm, and the radiation radius of a single grouting surface is not less than 3 m. Along with the enhancement of foundation pit soil intensity, the quantity of grout face can carry out partial reduction according to supporting intensity, but minimum grout face quantity should not be less than 2 layers, and the radiation radius of individual layer grout face is not less than 1.5 meters.

Furthermore, in the present invention, in order to improve the adhesion capability of the grouting channel 102, the diameter-expanding attachment heads 104 are disposed on the grouting channel 102 at regular intervals, and the diameter-expanding attachment heads 104 form an independent pile position after grouting, thereby improving the adhesion strength of the anchoring unit.

In addition, it should be further emphasized in the present invention that the grouting channel 102 and the perforation channel 103 are sequentially formed, and perforating fluid is generally used for perforating fluid during perforation, and particularly, in the present invention, the main component of the perforating fluid is a foam solution of a polymer, and the purpose of using the foam solution of the polymer is two aspects, on one hand, when high pressure exists, the foam solution of the high pressure impacts the side wall of the foundation pit to form a dominant channel, and due to the existence of the high pressure, the dominant channel always exists, and in order to further consolidate the dominant channel, after the foam solution is introduced, clear water needs to be further injected to maintain the dominant channel, and the dominant channel has the function of guiding the grouted concrete to form a grouting network in the side wall of the foundation pit. On the other hand, when the high pressure is withdrawn, the foam solution exists in the side wall of the foundation pit, only foam is left after water analysis after standing for a period of time, the foam can block gaps among the soil, namely, a net-shaped structure with a blocked boundary can be formed in the soil after perforation, so that grouting is facilitated, a grouting net with a higher stability can be formed more easily after grouting, a complete whole is formed on the side wall of the foundation pit after grouting, and the defect that the anchoring points are only discrete distribution points in the prior art is overcome.

Thirdly, based on the above method, after the grouting channel and the perforation channel are formed in the present invention, the next step is to arrange an anchor bar in the grouting channel, specifically in the present embodiment, the anchor bar is arranged in the grouting channel 102, an anchor plate 104 is arranged at the bottom of the anchor bar, and an anchor 105 is fixedly installed at the outer end of the anchor bar 103.

In order to match with the expanding attachment heads 104 arranged in the grouting channel, an anchor plate 104 is arranged at the position of each expanding attachment head 104, so that the wedging degree of the grouting channel 102 and the anchor bars is improved, and the supporting strength of the whole supporting system is further improved.

It should be further emphasized in the present invention that the grouting channel 102 and the perforation channel 103 are grouted as a whole, and need to be grouted simultaneously, and in order to make the grouting reach a designated position, a certain grouting pressure needs to be provided during grouting, and the grouting pressure can be determined according to field tests.

It is necessary to simultaneously fix the anchorage devices 105 at the outer ends of the anchor bars while grouting so as to integrally form a complete system of attached piles 1.

The construction of the complete system of the attached piles 1 is only the first step of the foundation pit support in the invention, and is also the most basic step, after the setting of the attached piles 1 is completed, the stress direction of the attached piles needs to be adjusted through the side pressure devices 2, so that a more stable support structure can be formed, and additional load on the attached piles 1 and the side pressure devices 2 caused by shearing force and the like is avoided.

Specifically, the side pressure device 2 includes a pressure-bearing steel ingot 201 whose side edge is hinged to the anchorage device 105, the pressure-bearing steel ingot 201 is a main stress component of the other structure of the whole supporting structure, and the angle between the pressure-bearing surface of the pressure-bearing steel ingot 201 and the connection structure is flexibly adjusted in a hinged manner, according to the mechanical analysis, only when the pressure-bearing surface of the pressure-bearing steel ingot 201 is perpendicular to the stress direction, the influence of the shearing force can be reduced as much as possible, therefore, in the present embodiment, the pressure-bearing steel ingot 201 is installed in a hinged manner, after the pressure-bearing steel ingot is adjusted to a proper position, a fine adjustment support rod 202 is fixedly installed on the other side of the pressure-bearing steel ingot 201, the other side of the pressure-bearing steel ingot 201 is supported and fixed by the adjustment effect of the fine adjustment support rod 202.

To further illustrate the specific operation of the fine adjustment support rod 202, a bearing frame (not shown) is disposed in the bearing hole of the anchor 105, the bearing frame is engaged with the fine adjustment support rod 202, a through hole is disposed in the middle of the bearing frame, the through hole is connected with the fine adjustment support rod 202 by engaging threads, when the fine adjustment support rod 202 is rotated, the position of the fine adjustment support rod 202 can be adjusted, so as to achieve the effect of fine adjustment support.

The operation principle of the fine adjustment support rod 202 in this embodiment is similar to that of an adjustable support foot used for adjusting the level at the bottom of a conventional refrigerator, washing machine, or other household appliance.

After the lateral pressure devices 2 on two sides are adjusted to be vertical to the stress direction, the lateral pressure devices 2 are provided with supporting main beams 3 through locking bases 5, and after a complete and reliable three-dimensional supporting structure is formed in a foundation pit by arranging the attachment piles 1, a supporting system on the surface of the foundation pit mainly considers how the foundation pit can be assembled and disassembled effectively and quickly so as to meet the requirements of construction of the foundation pit at different stages.

Therefore, in the present invention, the supporting main beam 3 is installed on the lateral pressure device 2 by optimizing the connection structure in a manner of locking the base 5, in this embodiment, the locking base 5 includes a fastening base 501 fastened with the pressure-bearing steel ingot 201, and the connection manner between the fastening base 501 and the pressure-bearing steel ingot 201 is a movable fastening, in this embodiment, since the pressure-bearing steel ingot 201 is adjusted to the optimal horizontal direction after being corrected, the influence of the shearing force can be avoided, so that the fixing requirement can be met by the fastening manner, and the detachment and reassembly of the whole external supporting structure can be facilitated.

In order to further improve the connection reliability of the whole device, the fastening base 501 can be fixed on the pressure-bearing steel ingot 201 in a bolt-assisted manner on the basis of fastening.

After the movable connection with pressure-bearing steel ingot 201 is realized, form between fastening base 501 and pressure-bearing layer board 502 and hold chamber 504 through the mode of fixed mounting pressure-bearing layer board 502 on fastening base 501's upper surface, adopt the mode of integral type to form and hold chamber 504, can improve and hold fixed reliability. And in the invention, the length of the supporting main beam 3 is fixed, so the supporting main beam 3 can be installed in this way.

The pressure bearing supporting plate 502 is provided with a limiting groove 503, the limiting groove 503 is present for providing a carrying position for the transverse support, in the invention, the transverse support is not carried out under the condition that the foundation pit with large span is not used, and the reliability of the support can be improved by adopting the transverse support mode under the condition that the foundation pit with small span is deeper. According to the invention, the applicability of the supporting structure application is improved by presetting the corresponding loading positions.

The supporting structure is characterized in that a transverse main beam channel 505 is arranged in the accommodating cavity 504, a supporting main beam 3 is arranged in the main beam channel 505, a vertical supporting channel 506 is arranged on the same plane of the main beam channel 505, supporting cantilevers 6 are arranged in the supporting channels 506, the supporting cantilevers 6 are arranged on two sides of the supporting main beam 3, pressure perpendicular to the supporting direction is formed on the supporting main beam 3 through extrusion of the supporting cantilevers 6, the stability of the supporting structure is improved under the combined action of multiple acting forces, in order to further improve the connection reliability of the supporting main beam 3 and the supporting cantilevers 6 on the locking base 5, whether a pulling buckle 507 is used for further connection or not can be flexibly selected according to the field condition, and the pulling buckle 507 is arranged at the port of the accommodating cavity 504.

As described above, the support cantilevers 6 are disposed on both sides of the latch base 5, and the frame guard 7 is disposed at the ends of the support cantilevers 6. The supporting cantilever 6 comprises a supporting short arm 601 which is arranged on the locking base 5 in an embedding mode, and in the invention, the connection between structures is in an embedding mode, meanwhile, the further fixing is assisted in a bolt mode, and the like, and in this mode, the whole supporting system can be further disassembled and reassembled.

Support the short boom 601 and install a plurality of in proper order through flexible adjusting device 602 outward and strut festival 603, strut the knot 603 through a plurality of and form vertical bearing structure, be provided with mount pad 604 on lieing in the support festival 603 of last position, be located and be provided with frame guard bar 7 on the mount pad 604 of same row.

The telescopic adjusting device 602 comprises a telescopic base rod 605 which is embedded in a positioning groove arranged on the support short arm 601 or the support section 603, progressive threads which are engaged with each other are arranged on the telescopic base rod 605 and the positioning groove, a load flat plate 606 is fixedly arranged at the other end of the telescopic base rod 605, a bearing platform 607 which is closed with the support section 603 is arranged on the surface of the load flat plate 606, and a plurality of auxiliary support rods 608 are arranged on the other surface of the bearing platform 607.

The supporting plate 4 is installed on the supporting main beam 3 through a fixing bolt, the supporting plate 4 is installed on the supporting main beam 3 through a movable connection mode, in order to improve the overall fixing performance of the supporting plate 4, two ends of the supporting plate 4 are connected with the frame protection rods 7 through hasps 401, a plurality of anchoring pile positions 402 are evenly arranged on the supporting plate 4, and each anchoring pile position 402 is provided with one anchoring pile 403. Each anchor pile 403 is driven directly into the interior wall of the side wall of the foundation pit to form a plurality of auxiliary support structures.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A foundation pit supporting structure is characterized by comprising a plurality of attached piles (1) anchored on two sides of a foundation pit, wherein side pressure devices (2) are fixedly mounted at the tops of the attached piles (1), supporting main beams (3) are mounted on the side pressure devices (2) through locking bases (5), supporting cantilevers (6) are arranged on two sides of each locking base (5), and frame protection rods (7) are arranged at the tail ends of the supporting cantilevers (6);

support and install a backplate (4) through fixing bolt on girder (3), the both ends of propping up backplate (4) all are connected with a fender rod (7) through hasp (401) evenly be provided with a plurality of anchor pile position (402) on propping up backplate (4), every anchor pile position (402) all are provided with one anchor pile (403).

2. A foundation pit supporting structure according to claim 1, wherein the attachment pile (1) comprises a temporary enclosure plate (101) arranged on the side wall of the foundation pit, a grouting channel (102) is formed in the side wall of the foundation pit through the temporary enclosure plate (101), a perforation channel (103) is formed in the grouting channel (102) in the direction perpendicular to the channel, a plurality of expanding attachment heads (104) are arranged on the grouting channel (102), an anchor bar (107) is arranged in the grouting channel (102), an anchor plate (106) is arranged at the bottom of the anchor bar (107), and an anchor (105) is fixedly arranged at the outer end of the anchor bar (107).

3. A foundation pit supporting construction according to claim 2, wherein the grouting channel (102) is at an angle of 10-30 ° to the horizontal.

4. A foundation pit supporting structure according to claim 2, wherein the side pressure device (2) comprises a pressure-bearing steel ingot (201) with the side edge hinged with the anchorage device (105), a fine adjustment supporting rod (202) is fixedly installed on the other side of the pressure-bearing steel ingot (201), and the other end of the fine adjustment supporting rod (202) is arranged in a pressure-bearing hole of the anchorage device (105).

5. The foundation pit supporting structure according to claim 1, wherein the supporting cantilever (6) comprises a supporting short arm (601) which is installed on the locking base (5) in an embedded mode, a plurality of supporting sections (603) are sequentially installed outside the supporting short arm (601) through a telescopic adjusting device (602), an installation seat (604) is arranged on the supporting section (603) located at the last position, and a frame protection rod (7) is arranged on the installation seat (604) located in the same column.

6. The foundation pit supporting structure according to claim 5, wherein the telescopic adjusting device (602) comprises a telescopic base rod (605) which is embedded in a positioning groove formed in the supporting short arm (601) or the supporting section (603), the telescopic base rod (605) and the positioning groove are respectively provided with progressive threads which are meshed with each other, a load flat plate (606) is fixedly installed at the other end of the telescopic base rod (605), a bearing platform (607) which is closed with the supporting section (603) is arranged on the surface of the load flat plate (606), and a plurality of auxiliary supporting rods (608) are arranged on the other surface of the bearing platform (607).

7. The foundation pit supporting structure according to claim 4, wherein the locking base (5) comprises a fastening base (501) connected with a pressure-bearing steel ingot (201) in a fastening mode, a pressure-bearing supporting plate (502) is fixedly mounted on the upper surface of the fastening base (501), a limiting groove (503) is formed in the pressure-bearing supporting plate (502), an accommodating cavity (504) is formed between the fastening base (501) and the pressure-bearing supporting plate (502), a transverse main beam channel (505) is formed in the accommodating cavity (504), a vertical supporting channel (506) is formed in the same plane of the main beam channel (505), and a pulling buckle (507) is fixedly mounted at a port of the accommodating cavity (504).

8. A method of facilitating the dismantling of a foundation pit supporting structure according to any one of claims 2 to 7, comprising the steps of:

and step 400, carrying out auxiliary support on the supporting plate.

9. The construction method for conveniently dismounting and mounting the foundation pit supporting structure according to claim 8, wherein in the step 200, the specific mounting method of the anchoring device is as follows:

10. The construction method for conveniently dismounting and mounting a foundation pit supporting structure according to claim 8, wherein in the step 300 and the step 400, the supporting method of the supporting plate is specifically as follows: