A prefabricated pile board support structure system and construction method for applying transverse prestress and integrating water stop and support

Abstract

The application relates to a prefabricated pile plate type supporting structure system and a construction method, which are integrated with water stopping and supporting, and are applied with transverse prestress, and the structure system comprises square piles and flange plates, the two sides of the square piles are provided with prefabricated pile plates, the two sides of the prefabricated pile plates are provided with the flange plates, a plurality of the prefabricated pile plates are sequentially arranged, the end faces of the two side flange plates are respectively provided with grooves and tenons, the grooves and the tenons on the adjacent prefabricated pile plates are mutually butted, the prefabricated pile plates are provided with prestressed anchor cable reserved holes, prestressed steel strand reserved holes and prestressed steel strands, the prefabricated pile plates are composed of starting point prefabricated pile plates, standard sections and terminal point prefabricated pile plates, the prestressed steel strands sequentially pass through the prestressed steel strand reserved holes on the starting point prefabricated pile plates, the standard section prefabricated pile plates and the terminal point prefabricated pile plates, and the exposed parts on the two sides of the prestressed steel strands are free end parts; the structure is firm in connection, convenient in assembly, improves supporting rigidity and water stopping effect, and effectively avoids the safety hidden danger caused by the poor pile-to-pile soil protection measures.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation pit prefabricated pile support, in particular to a prefabricated pile plate type support structure system and construction method for applying lateral prestress and integrating water stop and support. BACKGROUND

[0002] The common pile row support and water stop system at present is "cast-in-place bored pile + water stop curtain", and prestressed anchor or internal support is added if necessary. The support system includes crown beam and waist beam construction, has many construction procedures, long construction period and poor construction quality.

[0003] In addition, the common soil protection measures between piles at present have two forms of continuous protection and interval protection, and the concrete surface layer and pile row are connected through the way of reserved inserting reinforcement or planted reinforcement in the pile. The two ways are more complicated in construction, the planted reinforcement is easy to damage the pile body, and in the area with large temperature difference, the soil between piles is sprayed with anchor concrete, which is easy to crack or fall off, and a small part of soil is easy to seep water and cause the phenomenon of soil falling off, which causes certain hidden danger to the safety of pit bottom construction personnel and slope. SUMMARY

[0004] In view of the defects of the prior art, the present application aims to provide a prefabricated pile plate type support structure system for applying lateral prestress and integrating water stop and support. The lateral prestressed steel strand arranged on the pile body is used to replace the traditional crown beam and waist beam, so as to improve the overall rigidity of the support system, and achieve the purpose of integrating water stop and support.

[0005] In order to achieve the above technical purpose, the technical scheme of the present application provides a prefabricated pile plate type support structure system for applying lateral prestress and integrating water stop and support, which comprises:

[0006] Square pile, flange plate; the square pile is provided with prefabricated pile plates on both sides, each prefabricated pile plate is provided with flange plates on both sides, and a plurality of prefabricated pile plates are arranged in sequence, the end faces of the flange plates on both sides are respectively provided with grooves and tenons, and the grooves and tenons on the adjacent prefabricated pile plates are mutually butted, the prefabricated pile plate is provided with prestressed anchor cable reserved holes, prestressed steel strand reserved holes and prestressed steel strand, the prefabricated pile plate is composed of starting point prefabricated pile plate, standard section prefabricated pile plate and terminal point prefabricated pile plate, the prestressed steel strand passes through the prestressed steel strand reserved holes on the starting point prefabricated pile plate, standard section prefabricated pile plate and terminal point prefabricated pile plate in sequence, and the exposed parts of the prestressed steel strand on both sides are free end parts.

[0007] The present application further provides a construction method of the prefabricated pile plate type support structure system for applying lateral prestress and integrating water stop and support, which comprises the following steps:

[0008] S1. Preparing pile plate components with flange plates in a factory;

[0009] S2. Using a screen method, driving construction method, driving the precast pile plate support components along the design line of the foundation pit, and using a 3D level to ensure that the top elevations of the precast pile plates are the same, and using a groove and a tenon to connect the precast pile plates, and enclosing the space where the foundation pit is located by the support precast pile plates;

[0010] S3. After a section of precast pile plate is driven, the cable threading machine sets the first horizontal prestressed steel strand at the prestressed steel strand reserved hole at the top of the starting precast pile plate, the first row of prestressed steel strand reserved holes of the standard section precast pile plate, and the prestressed steel strand reserved hole at the top of the terminal precast pile plate, and tensioning the prestress; after excavating the earthwork to 0.5m below each row of prestressed steel strand reserved holes, the cable threading machine sets the corresponding horizontal prestressed steel strand in the prestressed steel strand reserved hole and tensioning the prestress, which can improve the overall rigidity of the support structure;

[0011] S4. Excavate the earthwork, drill and bury the anchor cable after excavating to 0.5m below each row of prestressed anchor cable reserved holes, and then apply prestress after grouting, until the construction of the entire support structure is completed.

[0012] Compared with the prior art, the technical scheme of the present application has the following beneficial technical effects:

[0013] The system structure is reasonable, adjacent components are connected by the engagement of the semicircular groove and the semicircular tenon, and are connected into a whole by the prestressed steel strand passing through the transverse prestressed steel strand reserved hole, the connection is firm and reliable, the on-site assembly is convenient, the overall rigidity and water stop effect of the support structure are improved, and the length of the real pile of the foundation pit water stop curtain is effectively reduced; compared with the traditional support system, the system reduces three processes of water stop curtain construction, soil spraying anchor concrete protection between piles, and crown beam and waist beam construction, effectively avoids the safety hidden danger caused by the poor traditional soil protection measures between piles, and the system components are intensively manufactured in a factory, the quality is easy to guarantee, the construction period is shortened, and good economic and environmental benefits are obtained. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 A structure schematic view of a precast pile plate support structure system for applying transverse prestress and integrating water stop and support is provided for the embodiments of the present application;

[0015] Figure 2 A starting precast pile plate structure schematic view is provided for the embodiments of the present application;

[0016] Figure 3 A standard section precast pile plate structure schematic view is provided for the embodiments of the present application;

[0017] Figure 4A schematic view of the end precast pile plate structure in the embodiment of the present application;

[0018] Figure 5 A schematic view of the first view angle structure of the pressure bearing plate in the embodiment of the present application;

[0019] Figure 6 A schematic view of the second view angle structure of the pressure bearing plate in the embodiment of the present application;

[0020] Figure 7 A schematic view of the use state of the prestressed steel strand in the embodiment of the present application; DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0022] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", "periphery" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0023] It should also be noted that unless otherwise explicitly specified and limited, the terms "provided", "connected", "spliced", "connected", "spliced", should be understood in a broad sense, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication between two components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] Please refer to Figures 1-7 The embodiment provides a precast pile plate support structure system which applies transverse prestress and integrates water stop and support, and comprises a square pile and a flange plate 2.

[0025] The square pile is provided with a prefabricated pile plate 1 on both sides, each prefabricated pile plate 1 is provided with a flange plate 2 on both sides, the flange plate 2 can reinforce the prefabricated pile plate 1, fully play the supporting effect of the prefabricated pile plate 1, and a plurality of prefabricated pile plates 1 are arranged in sequence, the end faces of the flange plates 2 on both sides are respectively provided with a groove 21 and a tenon 22, and the groove 21 and the tenon 22 on the adjacent prefabricated pile plate 1 are mutually butted, here, the preferred connection mode can be mutual adhesion and engagement splicing, the groove 21 is in the shape of an inner concave semicircular arc, the tenon 22 is in the shape of an outer convex semicircular arc, the groove 21 and the tenon 22 are correspondingly arranged and conform in size, the groove 21 is tightly attached to the inside of the tenon 22, and the adhesion part is coated with water-swelling waterproof glue, thereby enhancing the waterproof and connecting effect, the prefabricated pile plate 1 is provided with a prestressed anchor cable reserved hole 11, a prestressed steel strand reserved hole 12 and a prestressed steel strand 13, the prefabricated pile plate 1 is composed of a starting point prefabricated pile plate 14, a standard section prefabricated pile plate 15 and an end point prefabricated pile plate 16, the prestressed steel strand 13 sequentially passes through the prestressed steel strand reserved holes 12 on the starting point prefabricated pile plate 14, the standard section prefabricated pile plate 15 and the end point prefabricated pile plate 16, and the exposed parts on both sides of the prestressed steel strand 13 are free end parts 131. The free end part 131 is fixed with a concrete pedestal 132, the concrete pedestal 132 is fixed outside the prestressed steel strand reserved hole 12, and the outer end of the concrete pedestal 132 is inwardly inclined, thereby facilitating the later transverse prestress tensioning; the prestressed steel strand 13 is in the shape of a whole symmetrical inward hook, and the free end part 131 extends outward through the concrete pedestal 132; during installation, a 3D level meter is used to control the top elevations of the prefabricated pile plates 1 to be the same, thereby reducing positioning errors and preventing mispositioning of the adjacent prestressed steel strand reserved holes 12, and the prefabricated pile plate 1 is further provided with a threaded socket hole 17, a first orientation steel pipe 18 and a second orientation steel pipe 19, in order to facilitate the reader's understanding, here, it needs to be explained that the first orientation steel pipe 18 and the second orientation steel pipe 19 are steel pipes arranged in the vertical direction 3 and the horizontal direction 4 respectively, the threaded socket hole 17 is inclined upward and internally provided with a thread ring, the lower part of the first orientation steel pipe 18 is also provided with a thread ring, the steel pipe thread ring is adapted to the threaded socket hole 17, the first orientation steel pipe 18 is screwed into the threaded socket hole 17 to be fixed, the first orientation steel pipe 18 is fixedly connected with the second orientation steel pipe 19 and is perpendicular to each other, and the second orientation steel pipe 19 is connected to form a protective rail; during assembly, the first orientation steel pipe 18 with a thread at the bottom is screwed into the threaded socket hole 17 reserved at the top of the prefabricated pile plate 1 to be fixed, then the second orientation steel pipe 19, that is, the transverse steel pipe, is used to connect to form a protective rail, thereby ensuring the safety of pedestrians.

[0026] In this embodiment, the prestressed steel strand reserved hole 12 on the standard segment prefabricated pile plate 15 is located on the horizontal line intersecting with the center of the semicircular groove 21 and tenon 22, and it is explained that the horizontal line is arranged in the horizontal direction 4. The prestressed steel strand reserved hole 12 on the starting point prefabricated pile plate 14 and the ending point prefabricated pile plate 16 is respectively located on the same horizontal plane with the horizontal line. The prestressed steel strand reserved hole 12 includes the first direction hole 121 and the second direction hole 122, and the prestressed steel strand 13 passes through the first direction hole 121 and the second direction hole 122 to connect the starting point prefabricated pile plate 14, the standard segment prefabricated pile plate 15 and the ending point prefabricated pile plate 16 into a whole supporting body. In the supporting process, the prestressed steel strand 13 passes through the transverse prestressed steel strand reserved hole 12 to be connected into a whole for secondary fixation. It is explained that the transverse direction refers to the horizontal direction 4, the direction of the prestressed steel strand reserved hole 12 is consistent with the arrangement direction of the prestressed steel strand 13, which replaces the traditional crown beam and waist beam to connect the piles, and the connection is firm and reliable, which improves the overall rigidity of the supporting structure and the water stopping effect.

[0027] Preferably, the angle between the prestressed steel strand reserved hole 12 and the starting point prefabricated pile plate 14 and the ending point prefabricated pile plate 16 is less than 45°. The first direction hole 121 is arranged on the top of the prefabricated pile plate 1, and the hole opening direction is upward. The second direction hole 122 is located on a plane of the prefabricated pile plate 1, and the hole direction is inward of the square pile. That is, in the installation, the prestressed steel strand reserved hole 12 arranged in the transverse direction of the prefabricated pile plate 1 is not the same in the starting point prefabricated pile plate 14, the ending point prefabricated pile plate 16 and the standard segment prefabricated pile plate 15 of the supporting system. The prestressed steel strand reserved hole 12 of the standard segment prefabricated pile plate 15 is located on the horizontal line intersecting with the center of the semicircular groove. The centers of the prestressed steel strand reserved hole 12 on the top of the starting point prefabricated pile plate 14 and the ending point prefabricated pile plate 16 are located on the same vertical plane with the horizontal line, the angle between the hole and the horizontal line is less than 45°, and the hole opening direction is upward. It is explained that the same vertical plane refers to the same vertical section. The centers of the prestressed steel strand reserved hole 14 below the top of the starting point prefabricated pile 1 and the prestressed steel strand reserved hole 12 below the top of the ending point prefabricated pile plate 16 are located on the same horizontal plane with the horizontal line, the angle between the hole and the horizontal line is less than 45°, and the hole opening direction is inward of the pit, which is consistent with the direction of the later tension stress.

[0028] Preferably, the prestressed anchor cable reserved hole 11 is vertically arranged along the prefabricated pile plate 1, and a pressure bearing plate 111 is arranged outside the prestressed anchor cable reserved hole 11 to alleviate the extrusion on the prefabricated pile plate 1. The pressure bearing plate 111 is in the shape of a rectangle, a fixed hole 112 is arranged at the center position, and an assembly hole 113 is further arranged around the fixed hole 112. The fixed hole 112 corresponds to the position of the prestressed anchor cable reserved hole 11 on the inside, the anchor cable passes through the fixed hole 112 and is fixedly connected with the square pile and the soil body, and the prestress is applied through the anchor device to connect the pile body and the soil body into a whole. The anchor bar 114 passes through the assembly hole 113 and enters the inside of the square pile to fix the pile body. The number of the anchor bar 114 is set according to the requirements of the on-site construction to meet the supporting strength requirements.

[0029] The embodiment also provides a construction method of a prefabricated pile plate type support structure system for applying transverse prestress and integrating water stop and support, which comprises the following steps:

[0030] S1. Preparing a pile plate component with a flange plate 2 in a factory;

[0031] S2. Using a screen method to drive the prefabricated pile plate 1 type support component into the soil body along the design line of the foundation pit, and using a 3D level meter to ensure that the top elevations of the prefabricated pile plates 1 are the same. The prefabricated pile plates 1 are connected through the recess 21 and the tenon 22. The support pile plate encloses the space where the foundation pit is located.

[0032] S3. After a section of the prefabricated pile plate 1 is driven in, a first row of horizontal prestressed steel wires 13 is arranged in the prestressed steel wire reserved hole 12 at the top end of the starting prefabricated pile plate 1, the prestressed steel wire reserved hole 12 of the standard section prefabricated pile plate 15 and the prestressed steel wire reserved hole 12 at the top end of the terminal prefabricated pile plate 15 by a cable threading machine, and the prestress is tensioned. After excavating the earthwork to 0.5 m below each row of prestressed steel wire reserved holes 12, the corresponding horizontal prestressed steel wires 13 are arranged in the prestressed steel wire reserved holes 12 by the cable threading machine, and the prestress is tensioned. In this way, the overall rigidity of the support structure can be improved.

[0033] S4. Excavating the earthwork, drilling and burying the anchor cable after excavating to 0.5 m below each row of prestressed anchor cable reserved holes 11, grouting and applying prestress until the construction of the entire support structure is completed.

[0034] Preferably, personnel protection support is added between S2 and S3. S2 is performed first, then S3 is divided into two parts, S31 is performed, the first direction steel pipe 18 with threads is screwed into the threaded socket hole 17 reserved at the top of the pile body to fix it, and then the second direction steel pipe 19 is used to connect to form a protective rail to ensure the safety of pedestrians. Then S32 is performed, the prefabricated pile plate 1 is driven into the ground, the overall support of the foundation pit is performed, and finally S4 is performed to complete the overall construction.

[0035] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A precast pile-slab support structure system that applies transverse prestress and integrates water-stopping and support functions, comprising: A square pile and flange plate, characterized in that precast pile plates are provided on both sides of the square pile, and flange plates are provided on both sides of each precast pile plate, with multiple precast pile plates arranged sequentially. Grooves and tenons are respectively provided on the end faces of the flange plates on both sides, and the grooves and tenons on adjacent precast pile plates are interlocked. Each precast pile plate is provided with prestressed anchor cable reserved holes, prestressed steel strand reserved holes, and prestressed steel strands. Each precast pile plate consists of a starting precast pile plate, a standard section precast pile plate, and an ending precast pile plate. The prestressed steel strands pass through the precast pile plates sequentially. The prestressed steel strand reserved holes are located on the starting precast pile slab, the standard section precast pile slab, and the ending precast pile slab, and the exposed portions on both sides of the prestressed steel strand are free ends; the angles formed by the prestressed steel strand reserved holes with the starting precast pile slab and the ending precast pile slab are respectively less than 45°, and the prestressed steel strand reserved holes include a first direction hole and a second direction hole. The first direction hole is located on the top of the precast pile slab and the opening direction is upward, and the second direction hole is located on a plane of the precast pile slab and the hole faces the inner side of the square pile.

2. The precast pile-slab support structure system integrating transverse prestressing and water-stopping with support as described in claim 1, characterized in that, The upper end of the precast pile slab is also provided with a threaded socket hole, a first-position steel pipe, and a second-position steel pipe. The threaded socket hole is inclined upward and has a threaded ring inside. The lower part of the first-position steel pipe is also provided with a threaded ring. The threaded ring of the steel pipe is adapted to the threaded socket hole. The lower part of the first-position steel pipe is screwed into the threaded socket hole for fixation. The first-position steel pipe and the second-position steel pipe are fixedly connected and perpendicular to each other. The second-position steel pipe is connected to form a guardrail.

3. The precast pile-slab support structure system integrating transverse prestressing and water-stopping with support as described in claim 1, characterized in that, The groove is in the shape of an inwardly concave semi-circular arc, and the tenon is in the shape of an outwardly convex semi-circular arc. The prestressed steel strand reserved holes on the standard section precast pile plate are located on the horizontal line intersecting with the center of the groove and the center of the tenon semi-circular arc. The prestressed steel strand reserved holes on the starting point precast pile plate and the ending point precast pile plate are respectively located on the same horizontal plane as the horizontal line, and the prestressed steel strand passes through the first direction hole. The second direction hole connects the starting point precast pile plate, the standard section precast pile plate, and the ending point precast pile plate in series to form an integral support body.

4. The precast pile-slab support structure system integrating transverse prestressing and water-stopping with support as described in claim 1, characterized in that, A bearing plate is provided on the outside of the prestressed anchor cable reserved hole. The bearing plate is rectangular in shape, with a fixing hole in the center and assembly holes around it. The fixing hole corresponds to the position of the prestressed anchor cable reserved hole on the inside. The anchor cable passes through the fixing hole and is fixedly connected to the square pile and the soil. The anchor bar passes through the assembly hole and enters the inside of the square pile to fix the pile body. The number of anchor bars is set according to the on-site construction requirements.

5. The precast pile-slab support structure system integrating transverse prestressing and water-stopping with support as described in claim 1, characterized in that, The groove is provided corresponding to the tenon, the groove is tightly attached to the inside of the tenon, and the contact area is coated with water-swellable waterproof adhesive.

6. The precast pile-slab support structure system integrating transverse prestressing and water-stopping with support as described in claim 1, characterized in that, The free end is fixed with a concrete platform, which is fixed outside the reserved hole of the prestressed steel strand. The outer end of the concrete platform is inclined inward. The prestressed steel strand is symmetrically bent inward in a hook shape, and the free end extends outward through the concrete platform.

7. The construction method of the precast pile-slab support structure system integrating transverse prestressing and water-stopping and support as described in any one of claims 1 to 6, characterized in that, The specific steps are as follows: S1. Prefabricate pile-slab components with flanges in a factory; S2. The screen method is used to drive the precast pile slab support components into the soil along the design edge of the foundation pit. A 3D level is used to ensure that the top elevation of each precast pile slab is the same. The precast pile slabs are connected by grooves and tenons. The support precast pile slabs enclose the space where the foundation pit is located. S3. After a precast pile slab is driven in, the cable-threading machine sets the first horizontal prestressed steel strand in the prestressed steel strand reserved holes at the top of the starting precast pile slab, the first row of prestressed steel strand reserved holes in the standard section precast pile slab, and the top of the ending precast pile slab, and tensions the prestress. After excavating the earth to 0.5 m below each other row of prestressed steel strand reserved holes, the cable-threading machine sets the corresponding horizontal prestressed steel strand in the prestressed steel strand reserved holes and tensions the prestress. This can improve the overall stiffness of the support structure. S4. Excavate the earthwork, and after excavating to 0.5 m below the reserved holes of each row of prestressed anchor cables, drill holes to install anchor cables, grout and apply prestress until the construction of the entire support structure is completed.

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