CN115125965A - Joint box structure for foundation pit supporting occluded plain pile forming - Google Patents

Abstract

The invention relates to the technical field of foundation pit supporting, and discloses a joint box structure for forming a pile of a foundation pit supporting secant plain pile, which is inserted into a plain pile hole and comprises a plurality of standard sections and a bottom section, wherein the plurality of standard sections are sequentially butted up and down to form a standard section, and the top of the bottom section is butted with the bottom of the standard section; the joint box structure is characterized in that the area filled in the plain pile hole is consistent with the occlusion area of the occlusion pile, female joints are respectively arranged at the top of the standard section and the top of the bottom section, male joints are arranged at the bottom of the standard sections, the male joints of the adjacent standard sections are inserted into the female joints to realize butt joint, and the female joints of the bottom sections are in butt joint with the male joints of the adjacent standard sections; utilize joint case structure, the plain stake after the shaping has vacant interlock region, and the stake in-process of shaping meat does not need hard cutting concrete, and joint case structure includes bottom festival and a plurality of standard festival, docks between the adjacent standard festival through butt joint between male joint and the female joint, and convenient operation can correspond the butt joint according to actual degree of depth.

Description

Joint box structure for foundation pit supporting occlusal piles

technical field

The patent of the present invention relates to the technical field of foundation pit support, in particular, to a joint box structure used for foundation pit support to form a pile with an occlusal element pile.

Background technique

The foundation pit supporting occlusal pile is a continuous pile wall enclosure structure formed by the mutual occlusion of plain piles (plain concrete piles) and meat piles (reinforced concrete piles). It has good support and water-stop effect.

In the prior art, in the actual support design and construction, the occlusal pile is usually formed by the rotary excavation hard occlusal construction process. Rotary excavation hard bite construction is to first complete the two spaced plain piles, and then drill into the occlusal place between the two plain piles to form a meat pile hole, and then hang a steel cage in the meat pile hole and pour concrete to form a meat pile. pile.

Using the above construction method, when drilling to form a pile hole, a drill pipe is required to first cut the plain pile concrete, and then the rotary drilling bucket is replaced to remove the slag until the required pile hole is formed.

When drilling the meat pile holes, it is necessary to hard cut the plain pile concrete, which leads to long drilling time, and requires frequent replacement of drilling tools, which affects the drilling efficiency to a certain extent. Furthermore, when the meat pile holes are drilled, two The difference in the strength of the concrete of the lateral piles can easily lead to a certain degree of deflection when the pile holes are drilled. When the excavation depth of the foundation pit supported by the occlusal pile is greater than 15m, it is easy to cause occlusion and fork at the bottom of the foundation pit. , resulting in leakage between piles; in addition, the cut concrete is discharged as drilling slag, causing waste of concrete materials and increasing the amount of waste slag shipped.

At present, in order to solve the above-mentioned problems, after drilling the plain pile holes, after pouring concrete into the plain piles, it is hoped to form vacant occlusal areas on both sides of the plain piles. The phenomenon of hard cutting concrete will not occur.

After the plain pile hole is formed, a filling structure can be formed on the side of the plain pile hole. When the concrete is poured later, due to the limitation of the filling structure, when the concrete is initially set, the filling structure is pulled out, forming a vacant occlusal structure. However, The filling structure is difficult to run, resulting in an inability to create a vacant occlusal area on the formed pile.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a joint box structure for foundation pit support and occlusal pile formation, which aims to solve the problem in the prior art that it is difficult to form a vacant occlusal area on the base pile during the formation of the base pile.

The present invention is realized in the following way: the joint box structure used for foundation pit support and occlusal plain piles is inserted into the plain pile holes, and includes a plurality of standard sections and a bottom section, and a plurality of the standard sections are connected up and down in sequence, forming a standard section, the top of the bottom section is butted with the bottom of the standard section, the bottom of the bottom section abuts on the bottom of the plain pile hole, and the top of the standard section extends above the plain pile hole;

The area filled in the plain pile hole of the joint box structure is consistent with the occlusal area of the occlusal pile, the top of the standard section and the top of the bottom section are respectively provided with female joints, and the bottom of the standard section is provided with a male joint. The male joint of the standard section between adjacent ones is inserted into the female joint to realize butt joint, and the female joint of the bottom section is butted with the male joint of the standard section between adjacent ones.

Further, the structural frame of the standard section and the bottom section is the same, including two oppositely arranged arc-shaped plates, the ends of the two arc-shaped plates are butted together, and the two arc-shaped plates are enclosed to form a longitudinal direction. The enclosed cavity is arranged, and the middle part of the enclosed cavity is arranged to expand outward.

Further, the arc-shaped plate has an arc-shaped outer wall arranged toward the inner side wall of the pile hole, and when the arc-shaped plate is placed in the pile hole, the arc-shaped outer wall abuts the inner side wall of the pile hole.

Further, a web is provided in the enclosed cavity, the web is arranged along the longitudinal extension of the enclosed cavity, and both ends of the web are respectively butted with the inner side walls of the two arc-shaped plates.

Further, the female connector includes a female embedded section and two female connecting plates, the two female connecting plates are connected to the female embedded section and are arranged at intervals, and there are male connectors between the two female connecting plates. the insertion interval of the insertion;

The female embedded sections are embedded in the enclosed cavity and are respectively butted with two arc-shaped plates, the two female connecting plates are exposed outside the enclosed cavity, the female connecting plates are provided with female through holes, and the Bolts are pierced through the female through holes, the bolts pass through the male joints placed at the insertion intervals, and the female joints and the male joints are fixedly connected.

Further, the female embedding section includes two female end plates arranged at intervals, the two female end plates are embedded in the enclosed cavity and are butted with the two arc-shaped plates; There are a plurality of female butt plates, and both ends of the plurality of female butt plates are respectively butted with the female butt plates;

The two female connecting plates are arranged on one female end plate, and the other female end plate is arranged with a female extension plate, and the female extension plate is placed in the enclosed cavity and is butted with the web.

Further, the end of the arc-shaped plate is provided with a notch, the female connecting plate has a filling section embedded in the notch and an extension section extending above the notch, the female through hole is arranged in the filling section, the The extension segment extends into the enclosed cavity of the adjacent standard segment; the bottom of the insertion interval is provided with a female reinforcing plate, and the female reinforcing plate is respectively butted with the two female connecting plates.

Further, the male connector includes a male inserting section and a male connecting plate, the male connecting plate is connected to the female inserting section; the male inserting section is embedded in the enclosed cavity and is respectively butted with the two arc-shaped plates, The male connecting plate is exposed outside the enclosure cavity, and the male connecting plate is provided with a male through hole, the male connecting plate is inserted into the insertion interval of the two female connecting plates, and the male through hole and the female through hole are Aligned and communicated, the bolts respectively pass through the female through hole and the male through hole, and fixedly connect the female connector and the male connector;

One of the female through holes is provided with a welding socket, which is welded with the female connecting plate, and the other female through hole is provided with a welding cylinder, and the welding cylinder is penetrated in the insertion interval and passes through The male through hole is threadedly connected with the welding tooth cylinder, and the welding cylinder is welded with the female connecting plate;

The bolts pass through the welding cylinder and are threadedly connected with the welding cylinder, the bolts respectively pass through the two female through holes and the male through holes, and the outer periphery of the welding cylinder abuts the inner side wall of the male through holes.

Further, the male embedding section includes a male end plate, the male end plate is embedded in the enclosed cavity and is butted with the two arc-shaped plates; the male connecting plate is arranged on the outer end of the male end plate, and the male end plate is The inner end of the end plate is provided with a male extension plate, the male extension plate is placed in the enclosing cavity and is butted with the web, and the male extension plate and the female extension plate are respectively clamped on both sides of the web.

Further, the ends of the arc-shaped plates of two adjacent standard sections are butt-disposed.

Compared with the prior art, the joint box structure provided by the present invention is used for foundation pit support and occlusal piles to form piles. The joint box structure is used to run the joint box structure in the hole of the pile, and the side of the formed pile has vacant holes. In the occlusal area, in the subsequent process of forming the meat pile, there is no need to hard cut concrete, and the joint box structure includes a bottom section and a plurality of standard sections, and the adjacent standard sections are connected by the male joint and the female joint. The section and the standard section are also docked with the female joint through the male joint, which is easy to operate and can be docked according to the actual depth.

Description of drawings

Fig. 1 is the structural schematic diagram that the joint box structure provided by the present invention is used for foundation pit support occlusal pile pile;

Fig. 2 is the cross-sectional schematic diagram of the splice box provided by the present invention;

3 is a schematic front view of a standard section provided by the present invention;

4 is a schematic front view of adjacent standard sections provided by the present invention after docking;

Fig. 5 is the three-dimensional schematic diagram of the female connector provided by the present invention;

Fig. 6 is the three-dimensional schematic diagram of the male joint provided by the present invention;

FIG. 7 is a schematic front view of the male connector and the female connector provided by the present invention after docking.

Detailed ways

In order to make the mother, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The implementation of the present invention will be described in detail below with reference to specific embodiments.

The same or similar numbers in the drawings of this embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. structure and operation, so the terms describing the positional relationship in the accompanying drawings are only used for exemplary illustration, and should not be construed as a limitation on this patent, and those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

Referring to Figures 1-7, it is a preferred embodiment provided by the present invention.

The joint box structure 200 used for foundation pit support occlusal piles is inserted into the pile holes 100 and includes a plurality of standard sections 500 and a bottom section. The plurality of standard sections 500 are connected up and down in sequence to form a standard section, the bottom The top of the segment is butted against the bottom of the standard segment, the bottom of the bottom segment is abutted against the bottom of the base pile hole 100 , and the top of the standard segment extends above the base pile hole 100 .

The area filled in the plain pile hole 100 by the splice box structure 200 is consistent with the occlusal area of the occlusal pile. In this way, after the plain pile is formed, a vacant occlusal area is formed on the side of the plain pile. Then there is no need to hard cut concrete.

The top of the standard section 500 and the top of the bottom section are respectively provided with female joints 502, and the bottom of the standard section 500 is provided with a male joint 503. The female connectors 502 of the segments are butted with the male connectors 503 of the adjacent standard segments 500 .

In actual construction, using the joint box structure 200, the construction steps for supporting the occlusal piles in the foundation pit are as follows:

1), construct the plain pile hole 100 to the design elevation, and place the orifice platform 300 on the orifice of the plain pile hole 100;

2) Insert the joint box structure 200 in the pile hole 100. During the insertion process, the operation that needs to be inserted one by one is adopted, and the bottom section is first inserted, and then the standard section 500 is docked on the bottom section. In the process of entering the bottom section or the standard section 500, the bottom section or the standard section 500 can be directly fixed relative to the orifice platform 300 to realize the upper and lower docking;

After running into the joint box structure 200, the joint box structure 200 fills the space on the side of the plain pile hole 100, and the area filled in the plain pile hole 100 by the joint box structure 200 is consistent with the occlusal region of the occlusal pile;

3), pour concrete into the plain pile hole 100, form the plain pile, and the area filled by the joint box will not be filled with concrete; before the concrete is initially set, pull out the joint box structure 200, and remove the orifice platform 300; The sides of the plain post form vacant occlusal areas;

4) Repeat the construction step 1) to the construction step 3) to reshape the plain piles, the adjacent plain piles are arranged at intervals, and the occlusal areas on the adjacent plain piles are arranged relative to each other.

In addition, a meat pile hole is subsequently formed between the two plain piles. When drilling the meat pile hole, there is no need to cut the plain pile concrete. After the reinforcement cage is placed in the meat pile hole, the meat pile hole is poured into the meat pile hole. Concrete, the concrete fills the occlusal area at the same time to form a meat pile.

The above-mentioned joint box structure 200 for foundation pit support and occlusal piles is used to lower the joint box structure 200 in the pile hole 100, and the side of the formed pile has a vacant occlusal area. In the process of forming the meat pile, it is not necessary to hard cut concrete, and the joint box structure 200 includes a bottom section and a plurality of standard sections 500. The section and the standard section 500 are also docked with the female joint 502 through the male joint 503, which is easy to operate and can be docked according to the actual depth.

In this embodiment, the bottom section and the side wall of the standard section 500 are provided with engaging grooves. When the bottom section or the standard section 500 is lowered into the bottom section or the standard section 500, when the docking and fixing needs to be performed, the engaging strip 302 is used to pass through the engaging grooves. The bottom section or standard section 500 is fixed relative to the orifice platform 300 . In addition, the orifice platform 300 is provided with a limiting protrusion 301 . When the engaging strip 302 passes through the engaging groove, the outer side abuts the limiting protrusion 301 to maintain a stable engagement.

In addition, when pouring concrete, the pouring conduit 400 is passed through the orifice platform 300 and can be fixed, and the hopper 401 is connected to the top of the pouring conduit 400 to realize the pouring of concrete.

The standard section 500 has the same structural frame as the bottom section, including two oppositely arranged arc-shaped plates 202, the ends of the two arc-shaped plates 202 are butted together, and a longitudinally arranged enclosure cavity is formed between the two arc-shaped plates 202. 203, the middle part of the enclosed cavity 203 is arranged to expand outward. The cross-section of the enclosed cavity 203 is a football-shaped cross-section. Of course, according to the different occlusal regions, the shape of the arc-shaped plate 202 is correspondingly different.

The arc-shaped plate 202 has an arc-shaped outer wall arranged toward the inner side wall of the pile hole 100 . In this way, the occlusal area will not be filled with additional concrete when the pile is formed.

In this embodiment, the enclosed cavity 203 is provided with a web 204 , the web 204 is arranged along the longitudinal extension of the enclosed cavity 203 , and two ends of the web 204 are respectively butted with the inner side walls of the two arc-shaped plates 202 . The shape of the space between the two arcuate plates 202 is reinforced by the web 204 .

The female connector 502 includes a female inserting section and two female connecting plates 5023, the two female connecting plates 5023 are connected to the female inserting section and are arranged at intervals, and there is an insertion interval for the male connector 503 to be inserted between the two female connecting plates 5023 5024; the female embedded section is embedded in the enclosure cavity 203, and is respectively butted with the two arc-shaped plates 202, the two female connecting plates 5023 are exposed outside the enclosing cavity 203, and the female connecting plate 5023 is provided with a female through hole 5027, A bolt 600 is pierced through the female through hole 5027 , and the bolt 600 passes through the male connector 503 placed in the insertion space 5024 to fixedly connect the female connector 502 and the male connector 503 .

Through the female embedded section, the connection between the female connector 502 and the arc-shaped plate 202 can be formed, and through the bolt 600 passing through the two female connecting plates 5023 and the corresponding male connector 503, the connection between the female connector 502 and the male connector 503 can be realized. The docking, the operation is simple.

Further refinement, the female embedding section includes two female end plates 5021 arranged at intervals, the two female end plates 5021 are embedded in the enclosed cavity 203 and are butted with the two arc-shaped plates 202; There are a plurality of female butt plates 5022, and both ends of the plurality of female butt plates 5022 are respectively butted with the female butt plates 5022; two female connection plates 5023 are arranged on one female end plate 5021, and the other female end plate 5021 is provided with a female extension The plate 5026 and the female extension plate 5026 are placed in the enclosed cavity 203 and are butted with the web 204 .

In this way, by connecting the two female end plates 5021 with the arc-shaped plate 202 and the female extension plate 5026 with the web plate 204, the multi-position connection and fixation of the female embedded section can be realized, and the gap between the two arc-shaped plates 202 can be further strengthened. of stability.

In this embodiment, the end of the arc-shaped plate 202 is provided with a notch, the female connecting plate 5023 has a filling section embedded in the notch and an extension section extending above the notch, the female through hole 5027 is provided in the filling section, and the extension section extends into the enclosed cavity 203 of the adjacent standard segment; the bottom of the insertion interval 5024 is provided with a female reinforcing plate 5025, and the female reinforcing plate 5025 is respectively butted with the two female connecting plates 5023.

The two female connecting plates 5023 are reinforced through the female reinforcing plate 5025, and the filling section of the female connecting plate 5023 is embedded in the gap, reducing the outward extending length of the female connecting plate 5023. When the female connector 502 is butted with the male connector 503 Afterwards, the stability of the butt joint and the stability of the adjacent standard segments 500 can be maintained.

The male connector 503 includes a male insertion section and a male connection plate 5033, the male connection plate 5033 is connected to the male insertion section; the male insertion section is embedded in the enclosed cavity 203 and is respectively butted with the two arc-shaped plates 202, and the male connection plate 5033 Exposed outside the enclosure cavity 203, the male connecting plate 5033 is provided with a male through hole 5037, the male connecting plate 5033 is inserted into the insertion interval 5024 of the two female connecting plates 5023, and the male through hole 5037 is aligned and communicated with the female through hole 5027, The bolts 600 pass through the female through holes 5027 and the male through holes 5037 respectively, to fixedly connect the female connector 502 and the male connector 503;

A female through hole 5027 is provided with a welding socket 601, which is welded to the female connecting plate 5023, and the other female through hole 5027 is provided with a welding cylinder 602, which is inserted in the insertion space 5024 and passes through The male through hole 5037 is threadedly connected with the welding cylinder 601, and the welding cylinder 602 is welded with the female connecting plate 5023;

The bolts 600 pass through the welding barrel 602 and are threadedly connected to the welding barrel 602 . The bolts 600 respectively pass through the two female through holes 5027 and the male through holes 5037 .

In this way, by arranging the welding cylinder 601 and the welding cylinder 602 for direct screw fitting, the position between the male connecting plate 5033 and the two female connecting plates 5023 can be limited, and the threading of the bolt 600 can be positioned.

In this embodiment, the male inserting section includes a male end plate 5031, the male end plate 5031 is embedded in the enclosed cavity 203 and is butted with the two arc-shaped plates 202; the male connecting plate 5033 is arranged at the outer end of the male end plate 5031, The inner end of the end plate 5031 is provided with a male extension plate 5036. The male extension plate 5036 is placed in the enclosing cavity 203 and is butted against the web 204. The male extension plate 5036 and the female extension plate 5026 are respectively clamped on the web 204. on both sides.

After the female connector 502 is docked with the male connector 503, the male extension plate 5036 and the female extension plate 5026 are respectively arranged on both sides of the web 204 to clamp the web 204, which can enhance the connection between the female connector 502 and the male connector 503. Stability and enhanced torsion resistance.

The ends of the arc-shaped plates 202 of the two adjacent standard segments 500 are butt-disposed. Since the filling section of the female connecting plate 5023 is embedded in the gap, the male connecting plate 5033 of the male connector 503 is inserted between the two female connecting plates 5023 The insertion interval 5024 is set, and the extension of the female connecting plate 5023 is embedded in the adjacent enclosed cavity 203. When the ends of the arc-shaped plates 202 of the adjacent standard sections 500 are butted, the insertion connection of the bolts 600 will not be affected. , the abutment between the arc-shaped plates 202 is used to enhance the stability of the butt joint between the standard segments 500 .

The bottom of the bottom section is provided with an inclined end surface 201, so that the bottom of the bottom section is in a pointed shape, which is convenient for the bottom of the bottom section to be inserted below the bottom of the pile hole 100 to achieve stable positioning. In addition, the inclined end surface 201 is arranged toward the inner side wall of the pile hole 100, which will not affect the formation of the occlusal area.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. The joint box structure is inserted into a plain pile hole and comprises a plurality of standard sections and a bottom section, wherein the standard sections are sequentially butted up and down to form a standard section, the top of the bottom section is butted with the bottom of the standard section, the bottom of the bottom section is butted against the bottom of the plain pile hole, and the top of the standard section extends to the position above the plain pile hole;

the joint box structure is characterized in that the area filled in the plain pile hole is consistent with the occlusion area of the occlusion pile, female joints are respectively arranged at the top of the standard section and the top of the bottom section, male joints are arranged at the bottom of the standard section, the male joints of the adjacent standard sections are inserted into the female joints to realize butt joint, and the female joints of the bottom sections are in butt joint with the male joints of the adjacent standard sections.

2. The joint box structure for forming the pile of the occlusive pile for foundation pit support as claimed in claim 1, wherein the standard section is the same as the structural framework of the bottom section and comprises two arc-shaped plates which are oppositely arranged, the end parts of the two arc-shaped plates are butted, a longitudinally-arranged enclosure cavity is formed by the two arc-shaped plates in an enclosing mode, and the middle part of the enclosure cavity is outwards expanded and arranged.

3. The joint box structure for forming a pile of an occlusal plain pile of a foundation pit support of claim 1, wherein the arc-shaped plate has an arc-shaped outer wall disposed toward the inner side wall of the plain pile hole, the arc-shaped outer wall abutting against the inner side wall of the plain pile hole when the arc-shaped plate is disposed in the plain pile hole.

4. A joint box structure for forming a foundation pit support occlusive pile according to claim 2 or 3, wherein a web plate is arranged in the enclosure cavity, the web plate is arranged along the longitudinal extension of the enclosure cavity, and two ends of the web plate are respectively butted with the inner side walls of the two arc-shaped plates.

5. The joint box structure for forming the stake of an excavation supporting secant element stake of claim 4, wherein the female joint comprises a female embedding section and two female connecting plates, the two female connecting plates are connected to the female embedding section and are arranged in a spaced mode, and an inserting space for inserting the male joint is formed between the two female connecting plates;

the female embedding section is embedded into the enclosing cavity and is respectively butted with the two arc-shaped plates, the female connecting plates are exposed outside the enclosing cavity, female through holes are formed in the female connecting plates, bolts penetrate through the female through holes and penetrate through male connectors inserted into the female through holes at intervals, and the female connectors are fixedly connected with the male connectors.

6. The joint box structure for forming the foundation pit support occlusive element pile according to claim 5, wherein the female embedding section comprises two female end plates which are arranged at intervals, and the two female end plates are embedded in the enclosing cavity and are butted with the two arc-shaped plates; a plurality of female butt-joint plates are arranged between the two female end plates, and two ends of the plurality of female butt-joint plates are respectively in butt joint with the female butt-joint plates;

two female connecting plate sets up on a female end plate, another female end plate is provided with female extension board, female extension board is arranged in and is enclosed the chamber, and with the laminating butt joint of web.

7. The joint box structure for forming the foundation pit support occlusive element pile according to claim 6, wherein the end of the arc-shaped plate is provided with a notch, the female connecting plate is provided with a filling section embedded in the notch and an extending section extending to the position above the notch, the female through hole is arranged in the filling section, and the extending section extends into the enclosed cavity of the adjacent standard section; and the bottom of the insertion interval is provided with a female reinforcing plate, and the female reinforcing plate is respectively butted with the two female connecting plates.

8. The joint box structure for forming a pile of an excavation supporting occlusive pile of claim 5, wherein the male joint comprises a male embedded section and a male connecting plate, and the male connecting plate is connected to the female embedded section; the male embedding section is embedded in the enclosing cavity and is respectively butted with the two arc-shaped plates, the male connecting plate is exposed outside the enclosing cavity, a male through hole is formed in the male connecting plate, the male connecting plate is inserted into the insertion interval of the two female connecting plates, the male through hole is aligned and communicated with the female through hole, and the bolts respectively penetrate through the female through hole and the male through hole to fixedly connect the female joint with the male joint;

a welding tooth cylinder is arranged in one female through hole in a penetrating mode and welded with the female connecting plate, a welding cylinder is arranged in the other female through hole in a penetrating mode and penetrates through the male through hole to be in threaded connection with the welding tooth cylinder, and the welding cylinder is welded with the female connecting plate;

the bolt passes through a welding section of thick bamboo, and with a welding section of thick bamboo threaded connection, the bolt passes two female through-holes and public through-hole respectively, the periphery of a welding section of thick bamboo and the inside wall butt of public through-hole.

9. The joint box structure for forming a pile of an occlusal plain pile of a foundation pit support according to claim 8, wherein the male embedding section comprises a male end plate, the male end plate is embedded in the enclosed cavity and is butted with the two arc-shaped plates; the male connecting plate is arranged at the outer end of the male end plate, a male extending plate is arranged at the inner end of the male end plate, the male extending plate is arranged in the enclosing cavity and is abutted with the web plate in a fitting mode, and the male extending plate and the female extending plate are clamped on two sides of the web plate respectively.

10. The joint box structure for forming the foundation pit support secant pile as claimed in claim 8, wherein the ends of the arc-shaped plates of two adjacent standard joints are arranged in butt joint.

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