CN221052650U

CN221052650U - Prestressing force transmission device

Info

Publication number: CN221052650U
Application number: CN202322562166.XU
Authority: CN
Inventors: 卢云军; 陈伟伟; 胡世强; 谢振康
Original assignee: Zhejiang Province Institute of Architectural Design and Research
Current assignee: Zhejiang Province Institute of Architectural Design and Research
Priority date: 2023-09-20
Filing date: 2023-09-20
Publication date: 2024-05-31
Anticipated expiration: 2033-09-20

Abstract

The utility model discloses a prestress transmission device which comprises a pile body, wherein a bearing platform is connected above the pile body, a prestress rib is connected on the pile body, a transmission assembly is arranged on the top of the pile body, an anchor assembly is arranged above the transmission assembly, the transmission assembly comprises a reserved perforation, the prestress rib comprises a fixing part and a connecting part, the fixing part is fixedly connected with the pile body, the connecting part passes through the reserved perforation and is connected with the anchor assembly, and the transmission assembly and the anchor assembly are both arranged in the bearing platform. The utility model provides a prestress transmission device, which can transmit prestress to a bearing platform through a transmission assembly, can avoid forming a through hole on the bearing platform, ensures the integrity of the bearing platform, solves the hidden danger of water seepage, and can improve the construction efficiency.

Description

Prestressing force transmission device

Technical Field

The utility model relates to the technical field of anchoring structures, in particular to a prestress transmission device.

Background

With the continuous development of urban underground spaces, the depth of the basement is larger and larger, and the problem of floating resistance of the basement is more and more common. With the implementation of the "anti-floating technical standard of constructional engineering" (JGJ 476-2019), higher requirements are put on the durability of anti-floating members, so that the anti-pulling prestressed anchor rods and the prestressed concrete cast-in-place piles are increasingly widely applied.

For example, publication number "CN113550348a" discloses a "land large plate foundation anchor rod reinforcing structure, construction method, fan foundation structure", which comprises a concrete structure bearing platform, wherein a reinforced concrete layer is laid on the outer side surface of the concrete structure bearing platform, a plurality of holes are formed on the outer side surface of the concrete structure bearing platform, a prestressed anchor rod is arranged in each hole, one end of the prestressed anchor rod is inserted into each hole, the other end of the prestressed anchor rod is arranged in the reinforced concrete layer, and holes between the holes and the prestressed anchor rod are filled with grouting materials for bonding the prestressed anchor rod with the concrete structure bearing platform and the reinforced concrete layer. However, in practical application, because a plurality of tensioning holes are reserved at the top, concrete is needed to be used for secondary plugging after the prestressed tendons are tensioned, the construction period is delayed, and the hidden danger of water seepage is left after secondary pouring, so that the problem cannot be solved in the later stage.

Disclosure of Invention

Aiming at the problems of delay period and hidden water seepage hazards in the prior art mentioned in the background art, the utility model provides the prestress transmission device which can transmit prestress to the bearing platform through the transmission component, meanwhile, the through holes can be prevented from being formed in the bearing platform, the integrity of the bearing platform is ensured, the hidden water seepage hazards are solved, and the construction efficiency can be improved.

In order to achieve the above purpose, the present utility model adopts the following technical scheme.

The utility model provides a prestressing force transfer device, is including the pile body, pile body top is connected with the cushion cap, be connected with prestressing tendons on the pile body, transfer subassembly has been placed on the pile body top, transfer subassembly top is provided with the ground tackle subassembly, transfer subassembly is including reserving the perforation, prestressing tendons is including fixed part and connecting portion, fixed part and pile body fixed connection, connecting portion pass to reserve the perforation and be connected with the ground tackle subassembly, transfer subassembly and ground tackle subassembly all set up inside the cushion cap. The pile body is arranged below the bearing platform, in the construction process, the pile body is firstly constructed, meanwhile, a prestressed rib is reserved in the pile body, the prestressed rib is upwards exposed, the exposed part is a connecting part, the exposed part is a fixing part which is buried in the pile body, after the pile body reaches a certain strength, the surface is smoothed, meanwhile, a transmission assembly is sleeved on the outer side of the prestressed rib through reserved perforations, then the prestressed rib is tensioned and locked through an anchor assembly, bearing platform concrete is poured, and after the concrete reaches the design strength, the prestress is transmitted to the bearing platform through the transmission assembly, so that the anchoring effect is achieved; according to the scheme, the effect of firstly anchoring and then pouring the bearing platform can be achieved, so that the bearing platform is good in integrity, holes can be prevented from being formed in the top of the bearing platform, complex procedures of secondary pouring are avoided, construction efficiency is improved, subsequent water seepage hidden danger is solved, the integrity of the surface of the bearing platform is not affected, and meanwhile, prestress of the prestress rib is transmitted to the bearing platform and the pile body through the transmission assembly, and connection strength is improved.

Preferably, the transfer assembly comprises a lower plate, the lower plate is abutted to the top of the pile body, one side, far away from the pile body, of the lower plate is connected with a plurality of vertical ribs, and one side, far away from the lower plate, of the vertical ribs is connected with an upper plate. The transfer assembly comprises a lower plate, an upper plate and a plurality of vertical ribs arranged between the upper plates of the lower plate, the prestress can be transferred to the vertical ribs through the upper plate and the lower plate through the vertical ribs, so that the prestress is transferred to the pile body, and meanwhile, the prestress can be directly transferred to the bearing platform through the upper plate, so that an anchoring effect is achieved.

Preferably, the upper plate and the lower plate are respectively provided with a plate reserved hole, the vertical ribs are arranged in a ring shape, an intermediate cavity is formed between each vertical rib, and reserved holes are formed between the intermediate cavity and the two plate reserved holes. The reserved perforation is formed by the annular arrangement of the vertical ribs and the reserved holes of the upper plate and the lower plate, so that the prestressed ribs can pass through, and preferably, the reserved holes of the lower plate are in clearance fit with the prestressed ribs, so that the transmission assembly is convenient to accurately position and mount.

Preferably, in the radial direction of the transmission assembly, the cross-sectional area enclosed by the vertical ribs is smaller than the cross-sectional areas of the upper plate and the lower plate, and the transmission assembly has a girdling structure. Through setting up beam waist structure, can make upper plate and hypoplastron transmit prestressing force better, improve prestressing force's transmission effect and transmission homogeneity.

Preferably, a ring plate is arranged between each two adjacent vertical ribs. The annular plates are arranged on the vertical ribs, so that the connection relation between the vertical ribs can be improved, the bearing capacity of the vertical ribs is improved, meanwhile, the uniformity and stability of the transfer prestress of the vertical ribs are improved, the cross sections of the vertical ribs can be saved due to the fact that the annular plates are connected with the vertical ribs, the steel bars of the bearing platform can pass through conveniently, gaps are reserved between the vertical ribs due to the arrangement of the annular plates, and the quick filling of concrete in the bearing platform pouring process is facilitated.

Preferably, each vertical rib is annularly arranged around the reserved perforation, and each annular plate is in a fan-shaped structure. The vertical ribs are annularly arranged along the reserved perforations, and the annular plates between the vertical ribs are in a fan-shaped structure, so that the bearing capacity can be improved, the compression resistance of the vertical ribs in the radial direction is improved, and the fan-shaped structure can avoid interference to the prestressed tendons.

Preferably, in the axial direction of the transmission assembly, two ends of the vertical rib are provided with supporting rib positions, and the supporting rib positions respectively abut against the upper plate and the lower plate. The supporting ribs arranged on the end parts of the vertical ribs can effectively support the upper plate and the lower plate, so that the supporting area is increased, the transmission stability of the prestress is ensured, the stress concentration on the upper plate and the lower plate is reduced, and the structural strength of the upper plate and the lower plate in the prestress transmission process is ensured.

Preferably, the anchor assembly comprises a backing plate arranged at the top of the transmission assembly, one side, far away from the transmission assembly, of the backing plate is provided with an anchor element, and the anchor element is connected with the prestressed rib. The adaptability between the anchor and the upper plate is improved by arranging the base plate, the placement stability of the anchor is guaranteed, the placement area of the anchor can be improved by the base plate, so that a more stable prestress effect can be obtained, the anchor is connected with the prestress rib, and the prestress is locked by tensioning.

The beneficial effects of the utility model are as follows:

(1) The prestressed tendons are tensioned through the transmission assembly and the anchorage assembly, and then the bearing platform is poured, so that the transmission assembly and the anchorage assembly are arranged inside the bearing platform, the construction time is saved, the bearing platform and the pile body can be prestressed and transmitted, holes are formed in the bearing platform, and hidden danger of water seepage is avoided;

(2) By arranging the annular plates on the vertical ribs, gaps are reserved among the vertical ribs, so that the filling quality is improved, the bearing performance and stability of the vertical ribs can be enhanced, the section of the vertical ribs is saved, and the influence on the passing of the bearing platform reinforcing steel bars is avoided;

(3) The whole transmission assembly is arranged to be of a beam waist structure, so that the transmission prestress effect of the transmission assembly can be improved, and especially, the prestress is transmitted to the bearing platform through the upper plate, and the contact area between the upper plate and the bearing platform is larger due to the beam waist structure and the middle cavity.

Drawings

Fig. 1 is a first structural schematic of the present utility model.

Fig. 2 is a second structural schematic of the present utility model.

Fig. 3 is an isometric view of the transfer assembly of fig. 1.

Fig. 4 is an exploded view of the transfer assembly of fig. 1.

In the figure: the pile comprises a pile body 1, a pile body 2, a pile cap 3, a prestressed rib 31, a fixing part 32, a connecting part 4, a transmission component 41, a reserved perforation, a lower plate 42, a vertical rib 43, a supporting rib 431, an upper plate 44, a reserved plate 45, a middle cavity 46, a ring plate 47, an anchor component 5, a backing plate 51 and an anchor component 52.

Detailed Description

The utility model is further described below with reference to the drawings and specific embodiments.

With the continuous development of urban underground spaces, the depth of the basement is larger and larger, and the problem of floating resistance of the basement is more and more common. With the implementation of "anti-floating technical standard of constructional engineering" (JGJ 476-2019), the durability of anti-floating members is put forward higher requirements, so that anti-pulling prestressed anchors and prestressed concrete cast-in-place piles are increasingly widely used, and with the gradual improvement of demand factors of people for product quality, especially in terms of building construction, the modification time of the building construction is long and the construction is complex, so that for the building construction, one-time forming is required and no large-scale modification is performed later, the following problems still exist in the existing basement construction process: on the one hand, after the prestressed anchor rod or the prestressed cast-in-place pile is tensioned and anchored at the top of the anchor rod body or the pile top, the prestress cannot be transmitted to the bottom plate (bearing platform), if additional common reinforcing steel bars are arranged for transmitting the stress, the reinforcement distribution amount is quite large, the construction is quite uneconomical, and too many reinforcing steel bars are difficult, on the other hand, if the bottom plate (bearing platform) is tensioned and anchored at the top of the bottom plate (bearing platform) after the concrete strength of the bottom plate (bearing platform) meets the design requirement, many tensioning holes are reserved at the top surface of the bottom plate (bearing platform), the hole is closed by concrete after the prestress reinforcing steel bars are tensioned, the construction period is delayed, and the water seepage hidden danger can be reserved after secondary pouring.

Example 1:

As shown in fig. 1 and 2, a prestress transmission device comprises a pile body 1, a bearing platform 2 is connected above the pile body 1, a prestress rib 3 is connected on the pile body 1, a transmission component 4 is placed on the top of the pile body 1, an anchor component 5 is arranged above the transmission component 4, the transmission component 4 comprises a reserved perforation 41, the prestress rib 3 comprises a fixing portion 31 and a connecting portion 32, the fixing portion 31 is fixedly connected with the pile body 1, the connecting portion 32 penetrates through the reserved perforation 41 to be connected with the anchor component 5, and the transmission component 4 and the anchor component 5 are all arranged inside the bearing platform 2.

The pile body 1 is arranged below the bearing platform 2, in the construction process, firstly, the pile body 1 is built, meanwhile, a prestressed rib 3 is reserved in the pile body 1, the prestressed rib 3 is upwards exposed, the exposed part is a connecting part 32, the part which is buried in the pile body 1 is a fixing part 31, after the pile body 1 reaches a certain strength, the surface is leveled, a transmission assembly 4 is sleeved on the outer side of the prestressed rib 3 through a reserved perforation 41, then the prestressed rib 3 is tensioned and locked through an anchor assembly 5, then concrete of the bearing platform 2 is poured, and after the concrete reaches the design strength, the prestress is transmitted to the bearing platform 2 through the transmission assembly 4, so that the anchoring effect is achieved; the effect of anchor earlier and then pouring cushion cap 2 can be realized through above-mentioned scheme, consequently cushion cap 2's integrality is better, can avoid seting up the hole again at cushion cap 2's top, consequently also avoided secondary pouring's loaded down with trivial details process, improved the efficiency of construction to solved subsequent infiltration hidden danger, guaranteed cushion cap 2 surface's integrality and not influenced, transmit cushion cap 2 and pile body 1 with prestressing tendons 3's prestressing force through transfer subassembly 4 simultaneously, improve joint strength.

As shown in fig. 3 and 4, the transmission assembly 4 includes a lower plate 42, the lower plate 42 is abutted with the top of the pile body 1, one side of the lower plate 42 away from the pile body 1 is connected with four annular vertical ribs 43, one side of the vertical ribs 43 away from the lower plate 42 is connected with an upper plate 44, plate reserved holes 45 are respectively formed in the upper plate 44 and the lower plate 42, an intermediate cavity 46 is formed between each vertical rib 43, the intermediate cavity 46 and the two plate reserved holes 45 form reserved perforations 41, in the radial direction of the transmission assembly 4, the cross-sectional area surrounded by the vertical ribs 43 is smaller than the cross-sectional area of the upper plate 44 and the lower plate 42, the transmission assembly 4 is in a girdling structure, a ring plate 47 is arranged between each two adjacent vertical ribs 43, each ring plate 47 is in a fan-shaped structure, and support rib positions 431 are respectively abutted against the upper plate 44 and the lower plate 42 along the axial direction of the transmission assembly 4.

The transmission assembly 4 comprises a lower plate 42, an upper plate 44 and a plurality of vertical ribs 43 arranged between the upper plates 44 of the lower plate 42, wherein the prestress can be transmitted to the vertical ribs 43 through the upper plate 44 and to the lower plate 42 through the vertical ribs 43 so as to be transmitted to the pile body 1, and meanwhile, the prestress can be directly transmitted to the bearing platform 2 through the upper plate 44 so as to achieve an anchoring effect; the vertical ribs 43 are annularly arranged and the reserved holes 45 on the upper plate 44 and the lower plate 42 form reserved perforations 41, so that the prestressed tendons 3 can pass through, meanwhile, as the vertical ribs 43 are annularly arranged and the middle cavities 46 are reserved between the vertical ribs 43, the rapid filling of concrete can be ensured, and the contact area between the upper plate 44 and the bearing platform 2 is ensured to the greatest extent; by providing the bundled waist structure, the upper plate 44 and the lower plate 42 can better transmit prestress, and the transmission effect and transmission uniformity of the prestress are improved; the arrangement of the annular plates 47 on the vertical ribs 43 can improve the connection relation between the vertical ribs 43, improve the bearing capacity of the vertical ribs 43, and improve the uniformity and stability of the transfer prestress of the vertical ribs 43 at the same time, and the cross section of the vertical ribs 43 can be saved because the annular plates 47 are connected with the vertical ribs 43, so that the steel bars of the bearing platform 2 can pass through conveniently, gaps are reserved between the vertical ribs 43 due to the arrangement of the annular plates 47, and the rapid filling of concrete in the process of pouring the bearing platform 2 is facilitated; the vertical ribs 43 are annularly arranged along the reserved perforations 41, and the annular plates 47 between the vertical ribs 43 are in a fan-shaped structure, so that the bearing capacity can be improved, the compression resistance of the vertical ribs 43 in the radial direction is improved, and interference to the prestressed ribs 3 can be avoided by the fan-shaped structure; the supporting rib positions 431 arranged on the end parts of the vertical ribs 43 can effectively support the upper plate 44 and the lower plate 42, so that the supporting area is increased, the transmission stability of the prestress is ensured, meanwhile, the stress concentration on the upper plate 44 and the lower plate 42 is reduced, and the structural strength of the upper plate 44 and the lower plate 42 in the prestress transmission process is ensured.

As shown in fig. 2, the anchor assembly 5 includes a backing plate 51 disposed on the top of the transmission assembly 4, and an anchor member 52 is disposed on a side of the backing plate 51 away from the transmission assembly 4, where the anchor member 52 is connected to the tendon 3. The adaptability between the anchor 52 and the upper plate 44 is improved by arranging the backing plate 51, the placement stability of the anchor 52 is guaranteed, the placement area of the anchor 52 can be increased by the backing plate 51, so that a more stable prestress effect can be obtained, and the anchor 52 is connected with the prestress rib 3, so that the prestress is locked by tensioning.

The assembly and operation of the prestressing force transfer device in this embodiment is as follows: firstly, constructing a pile body 1, pre-burying a prestressed rib 3 in the pile body 1, wherein the prestressed rib 3 is partially arranged in the pile body 1, and partially exposed, after the pile body 1 reaches the strength, trowelling the surface of the pile body 1, then penetrating the prestressed rib 3 through a transmission component 4, ensuring that the position of the prestressed rib 3 is reserved on the axis position of a perforation 41, placing a backing plate 51 above an upper plate 44 of the transmission component 4 after the transmission component 4 is placed flat, installing an anchor piece 52 on the backing plate 51, connecting the anchor piece 52 with a connecting part 32, carrying out tensioning locking prestress on the prestressed rib 3, transmitting the prestress to a vertical rib 43 through the upper plate 44 before the concrete of the pile cap 2 is not poured, finally transmitting the prestress to the pile body 1 which reaches the strength through the vertical rib 43, and then directly transmitting the prestress to the pile cap 2 through the upper plate 44 after the concrete reaches the design strength, thereby achieving an anchoring effect, and being capable of carrying out tensioning locking prestress on the pile cap 2 through the transmission component 4, and the anchor piece 5, and the pile cap 2 can not be connected with the pile cap 2 in a construction process, thus the hidden danger is avoided, and the pile cap 2 is not transmitted in the pile body 2 is connected through the transmission of the anchor piece 5; meanwhile, in the embodiment, the annular plates 47 are arranged on the vertical ribs 43, so that gaps are reserved among the vertical ribs 43, the filling quality is improved, the bearing performance and stability of the vertical ribs 43 can be enhanced, the section of the vertical ribs 43 is saved, and the influence on the passing of reinforcing steel bars of the bearing platform 2 is avoided; the transmission assembly 4 is integrally arranged to be of a beam waist structure, so that the transmission prestress effect of the transmission assembly 4 can be improved, and particularly, the prestress is transmitted to the part of the bearing platform 2 through the upper plate, and the contact area between the upper plate and the bearing platform 2 is larger due to the beam waist structure and the existence of the middle cavity.

Claims

1. The utility model provides a prestressing force transmission device, including pile body (1), pile body (1) top is connected with cushion cap (2), its characterized in that, be connected with prestressing tendons (3) on pile body (1), transmission subassembly (4) have been placed on pile body (1) top, transmission subassembly (4) top is provided with ground tackle subassembly (5), transmission subassembly (4) are including reserving perforation (41), prestressing tendons (3) are including fixed part (31) and connecting portion (32), fixed part (31) and pile body (1) fixed connection, connecting portion (32) pass to reserve perforation (41) and be connected with ground tackle subassembly (5), transmission subassembly (4) all set up inside cushion cap (2) with ground tackle subassembly (5).

2. The prestress transmission device according to claim 1, wherein the transmission assembly (4) comprises a lower plate (42), the lower plate (42) is abutted against the top of the pile body (1), a plurality of vertical ribs (43) are connected to one side, away from the pile body (1), of the lower plate (42), and an upper plate (44) is connected to one side, away from the lower plate (42), of the vertical ribs (43).

3. A prestressing force transmission device according to claim 2, characterized in that the upper plate (44) and the lower plate (42) are provided with plate preformed holes (45), the vertical ribs (43) are arranged in a ring, an intermediate chamber (46) is formed between each vertical rib (43), and the intermediate chamber (46) and the two plate preformed holes (45) form preformed perforations (41).

4. A prestressing force transfer arrangement according to claim 2, characterized in that the cross-sectional area enclosed by the vertical ribs (43) is smaller than the cross-sectional area of the upper plate (44) and the lower plate (42) in the radial direction of the transfer assembly (4), the transfer assembly (4) being of corset construction.

5. A prestressing force transfer arrangement according to any of claims 2-4, characterized in that a ring plate (47) is arranged between each adjacent vertical rib (43).

6. A prestressing force transfer arrangement according to claim 5, characterized in that each of the vertical ribs (43) is arranged annularly around the reserved perforations (41) and each of the ring plates (47) is in a fan-like configuration.

7. A prestressing force transfer arrangement according to any of claims 2-4, characterized in that supporting rib locations (431) are provided on both ends of the vertical rib (43) in the axial direction of the transfer assembly (4), which supporting rib locations (431) abut the upper plate (44) and the lower plate (42), respectively.

8. A prestressing force transfer arrangement according to any of claims 1-4, characterized in that the anchor assembly (5) comprises a shim plate (51) arranged on top of the transfer assembly (4), the shim plate (51) being provided with an anchor element (52) on the side remote from the transfer assembly (4), the anchor element (52) being connected to the prestressing tendons (3).