Pile foundation structure for seasonal construction in high altitude areas

Abstract

The invention discloses a seasonal pile foundation structure for high altitude areas, which relates to the field of foundation construction, including an excavated pile foundation pit, a plurality of pile holes for pile foundation construction are excavated at the bottom of the pile foundation pit, a pile foundation steel cage is placed in each of the pile holes, the top of the pile foundation steel cage is connected to the foundation pit bottom plate through a pre-embedded connector at the top of the steel cage, and the side wall of the foundation pit bottom plate is connected to the surrounding purlin constructed on the side wall of the foundation pit through a pre-embedded connector on the side wall; the pile foundation steel cage is connected to a reinforced support structure that can be deployed. The pile foundation structure can well adapt to seasonal frozen soil environments, and the foundation may be fractured or unevenly settled due to frost heave or thaw settlement of soil or rock mass.

Description

Technical Field

[0001] The invention relates to the field of foundation construction, in particular to a pile foundation structure for seasonal construction in high-altitude areas. Background Art

[0002] In recent years, the demand for transportation infrastructure construction has been increasing, and the improvement of land transportation networks such as highways and railways is the first priority. However, as an important part of transportation construction, tunnels and bridges have been under construction in recent years. Especially in high-altitude areas, due to the high altitude and seasonal frozen soil environment, it is inevitable to build bridges, roads and other projects in these seasonal frozen soil environment areas. From the formation conditions of frozen soil, it can be seen that the freezing of soil is the process in which the phase state of water in frozen soil changes under the action of temperature. The engineering problems caused by frozen soil are caused by the volume change caused by the phase change of water. Therefore, the study of frozen soil is to study the temperature field of frozen soil and its physical and mechanical properties after frozen soil. As the basic condition for the formation of frozen soil, temperature, under certain conditions, determines the ice formation law, water migration, frost heave and thaw settlement in the freezing process of soil.

[0003] In high-altitude seasonal frozen soil environments, bridges, roads, and photovoltaic construction projects are generally built with deep foundation pits and pile foundations due to geological conditions. After the foundation is excavated, the original thermally balanced soil or rock mass around it is destroyed, causing the foundation to frost or thaw, resulting in fractures or uneven settlement of the foundation, thus affecting the foundation quality of the bridges, roads, photovoltaic construction projects, etc. Therefore, accurately understanding the frost heave mechanism of seasonal frozen soil in high-altitude areas is of great significance to solving the frost heave problem in foundation construction in high-altitude areas.

[0004] With the development of foundation engineering, traditional pile foundations can no longer meet the needs of various projects. While improving the bearing capacity of the foundation, the pursuit of higher stability has become an important development direction of modern foundation engineering. Therefore, the size of the foundation piles has gradually increased, and the length has gradually increased. More and more projects use large-diameter super-long piles; however, although these measures increase the stability of the piles and foundations, they increase the requirements for construction materials and pile drivers; at the same time, due to the high altitude areas, higher requirements are placed on the work and health of the construction personnel; and increasing the size and length of the pile foundation cannot overcome the uneven settlement of the pile foundation and foundation caused by the freezing and thawing of seasonal frozen soil, and the settlement or uplift of the soil or rock mass around the foundation pit. Therefore, in the construction of high-altitude seasonal frozen soil environment areas, how to reduce or avoid the occurrence of the above-mentioned diseases in the construction of pile foundations and foundations is an engineering problem that urgently needs to be solved in the current construction in high-altitude areas. Summary of the invention

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A seasonal pile foundation structure for construction in high altitude areas, comprising an excavated pile foundation pit, a plurality of pile holes for pile foundation construction excavated at the bottom of the pile foundation pit, a pile foundation steel cage placed in each of the pile holes, the top of the pile foundation steel cage connected to the foundation pit bottom plate through a pre-embedded connector at the top of the steel cage, and the side wall of the foundation pit bottom plate connected to the surrounding purlin constructed on the side wall of the foundation pit through a pre-embedded connector on the side wall;

[0007] The pile foundation steel cage is connected with a reinforced support structure which can be deployed.

[0008] Preferably, the reinforcing support structure comprises a movable steel reinforcement collar;

[0009] The movable steel bar ring is connected to a plurality of movable sleeves connected to the movable steel bar ring, and the movable sleeves can be raised and lowered and are arranged on the vertical main bars of the pile foundation steel bar cage;

[0010] The movable steel bar ring is also connected to a plurality of sliding connection sleeves arranged through the center, and the hollow cavity of the sliding connection sleeve is used to pass the movable adjustable steel bar, and one end of the movable adjustable steel bar close to the sliding connection sleeve is bolted to the inner wall of the hollow cavity of the sliding connection sleeve, and the other end of the movable adjustable steel bar is movably passed through the movable limiting steel ring and leaked to the top surface of the pile foundation steel bar cage. The movable limiting steel ring is welded to the steel bars of the pile foundation steel bar cage and is used to movably guide the movable adjustable steel bar.

[0011] Preferably, the bottom end of the sliding connection sleeve on one side close to the pile foundation borehole wall is hinged with a hinged steel plate through a hinge seat, the end of the hinged steel plate away from the sliding connection sleeve is hinged to the middle part of the supporting steel plate through a hinge seat, and the top end of the supporting steel plate is hinged to the stirrups of the pile foundation steel cage through a hinge seat.

[0012] Preferably, the embedded connector at the top of the reinforcement cage includes a connection base, and the reinforcement at the top of the pile foundation reinforcement cage is extended and placed in the connection base, and is integrally cast with the concrete of the connection base;

[0013] A plurality of base steel bars are connected around the top of the connection base, and the plurality of base steel bars extend into the steel bar skeleton of the foundation pit bottom plate and are connected to the steel bar skeleton of the foundation pit bottom plate;

[0014] The top of the connecting base is movably connected to a movable connecting seat, and the top of the movable connecting seat is connected to a plurality of bottom plate connecting ribs, which also extend into the steel frame of the foundation pit bottom plate and are connected to the steel frame of the foundation pit bottom plate.

[0015] Preferably, the bottom end of the movable connection seat is connected to the connection base through a base double-headed ball joint structure;

[0016] The base double-headed ball joint structure comprises a first base ball head and a second base ball head, and the first base ball head and the second base ball head are connected via a connecting column;

[0017] One end of the first base ball head away from the second base ball head is movably connected to the first base ball head seat, and the first base ball head seat is arranged and installed in the movably connected seat;

[0018] One end of the second base ball head away from the first base ball head is movably connected to the second base ball head seat, and the second base ball head seat is arranged and installed in the connecting base.

[0019] Preferably, the movable connection seat is connected to a circle of connecting bosses at one end close to the connecting base, and the outer wall of the connecting bosses is connected to a movable sliding block arranged toward the outer wall of the connecting base;

[0020] The connecting base has a circle of movable grooves at one end close to the movable connecting seat, and the connecting boss is movably placed in the movable grooves;

[0021] The bottom end of the movable groove is provided with an movable limiting sliding groove for the movable sliding block.

[0022] Preferably, the side wall embedded connector comprises a side wall connecting seat embedded in the side wall of the foundation pit foundation bottom plate;

[0023] One end of the side wall connecting seat close to the purlin is movably connected to the purlin through the purlin double-end ball joint structure;

[0024] The double-headed ball joint structure of the surrounding purlin includes a first surrounding purlin ball head and a second surrounding purlin ball head, wherein the first surrounding purlin ball head and the second surrounding purlin ball head are connected via a second ball rod connecting column;

[0025] One end of the first purlin ball head away from the second purlin ball head is movably connected to the first purlin ball head seat, and the first purlin ball head seat is arranged and installed in the side wall connecting seat;

[0026] One end of the second surrounding purlin ball head away from the first surrounding purlin ball head is movably connected to the second surrounding purlin ball head seat, and the second surrounding purlin ball head seat is arranged and installed in the surrounding purlin.

[0027] Preferably, the outer wall of the second club connecting column is provided with a telescopic movable telescopic sleeve;

[0028] One end of the movable telescopic sleeve is connected to the surrounding purlin, and the other end of the movable telescopic sleeve is connected to the side wall connecting seat;

[0029] A high-strength deformation spring is arranged between the movable telescopic sleeve and the second ball rod connecting column. The high-strength deformation spring is passed through the second ball rod connecting column. One end of the high-strength deformation spring is connected to the surrounding purlin, and the other end of the high-strength deformation spring is connected to the side wall connecting seat.

[0030] Preferably, a movable hinge structure is provided between the surrounding purlin and the side wall connecting seat;

[0031] The movable hinge structure comprises a first movable hinge frame and a second movable hinge frame;

[0032] The first movable hinge and the second movable hinge are rotatably hingedly connected at their ends close to each other via a hinge shaft;

[0033] One end of the first movable hinge away from the second movable hinge is hinged to the side wall connecting seat through a hinge seat;

[0034] One end of the second movable hinge away from the first movable hinge is hinged to the surrounding purlin through a hinge seat.

[0035] Preferably, one end of the side wall connecting seat close to the surrounding purlin is pre-embedded with movable telescopic connecting steel bars around it, and the other end of the movable telescopic connecting steel bar can be movably inserted into a movable steel bar sleeve, and the movable steel bar sleeve is pre-embedded and connected in the surrounding purlin.

[0036] The beneficial effects of the present invention are as follows: the purpose of the present invention is to provide a pile foundation structure for seasonal construction in high altitude areas. The pile foundation structure can be constructed and used in seasonal frozen soil environments in high altitude areas. The pile foundation structure can well adapt to seasonal frozen soil environments. Due to the frost heave or thaw settlement of soil or rock mass, the foundation may be fractured or unevenly settled. The pile foundation structure is different from the traditional pile foundation construction. The structure of the pile foundation constructed can increase the support limit and friction force with the pile foundation hole constructed, and reduce the sinking of the pile foundation caused by the load of the upper foundation pit bottom plate structure; at the same time, the top of the pile foundation cast by the pile foundation steel cage is connected to the foundation pit bottom plate through the pre-embedded connector at the top of the steel cage. The pre-embedded connector at the top allows the foundation pit bottom plate and the top of the formed pile foundation to maintain a certain degree of mobility, so that when the soil or rock mass of the foundation pit bottom plate is frozen or thawed, the foundation pit foundation bottom plate is fractured or settled, and the anti-shear failure performance of the foundation pit foundation bottom plate is improved; and the side wall of the foundation pit foundation bottom plate is pre-embedded in the side wall. The connecting parts are connected to the purlins constructed on the side walls of the foundation pit, so that the foundation pit base plate is connected to the purlins, which are subjected to overall force and have a certain amount of movable deformation space, thereby reducing the fracture or cracking of the foundation pit base plate due to deformation of the foundation soil or rock mass and shear stress, and allowing the foundation pit base plate and the soil around the foundation pit to sink appropriately with the foundation soil or rock mass while maintaining support, without causing large tension to the surrounding soil or rock and soil, thereby causing the soil or rock and soil around the construction pit to sink or bulge, affecting the upper main construction structure or surrounding buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall connection effect of the pile foundation structure for seasonal construction in high altitude areas of the present invention;

[0038] Figure 2 It is a schematic diagram of the connection structure between the pile foundation steel cage and the embedded parts at the top of the steel cage of the pile foundation structure for seasonal construction in high altitude areas of the present invention;

[0039] Figure 3 It is an exploded schematic diagram of the connection structure between the pile foundation reinforcement cage and the embedded parts at the top of the reinforcement cage of the seasonal construction pile foundation structure in high altitude areas of the present invention;

[0040] Figure 4 A schematic diagram of a pile foundation reinforcement cage connection structure of a seasonal construction pile foundation structure in a high altitude area of ​​the present invention;

[0041] Figure 5 It is a schematic diagram of the explosion of the pile foundation reinforcement cage connection structure of the seasonal construction pile foundation structure in high altitude areas of the present invention;

[0042] Figure 6 It is a schematic diagram of the supporting structure connection structure of the pile foundation structure for seasonal construction in high altitude areas of the present invention;

[0043] Figure 7 It is a schematic diagram of the connection structure of the pre-embedded parts at the top of the steel cage of the seasonal construction pile foundation structure in high altitude areas of the present invention;

[0044] Figure 8 It is an exploded schematic diagram of the connection structure of the pre-embedded parts at the top of the reinforcement cage of the seasonal construction pile foundation structure in high altitude areas of the present invention;

[0045] Fig. 9 It is a schematic diagram of the connection structure of the connection base of the seasonal construction pile foundation structure in high altitude areas of the present invention;

[0046] Fig.10 This is a schematic diagram of the structure of the movable connection seat of the pile foundation structure for seasonal construction in high altitude areas of the present invention;

[0047] Fig.11 It is a schematic diagram of the connection structure of the side wall pre-embedded connection piece of the pile foundation structure for seasonal construction in high altitude areas of the present invention;

[0048] Fig.12 It is an exploded schematic diagram of the connection structure of the side wall pre-embedded connection piece of the pile foundation structure for seasonal construction in high altitude areas of the present invention;

[0049] In the figure, 1-pile foundation steel cage, 2-foundation pit foundation bottom plate, 3-purlin, 11-movable steel ring, 12-movable sleeve, 13-sliding connection sleeve, 14-movable adjustment steel bar, 15-hinge steel plate, 16-support steel plate, 21-connecting base, 22-movable connecting seat, 23-base double-headed ball joint structure, 31-side wall connecting seat, 32-purlin double-headed ball joint structure, 33-movable telescopic sleeve, 34-high-strength deformation spring, 35-first movable hinge, 36-second movable hinge, 37-movable telescopic connecting steel bar, 211-base steel bar, 221-bottom plate connecting rib, 222-connecting boss. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0051] Example 1

[0052] like Figure 1As shown, in high-altitude areas, due to the high terrain and seasonal frozen soil environment, the foundation construction in this area is different from the general foundation construction. In order to overcome some difficulties encountered in construction in high-altitude areas, such as: due to the lack of oxygen in high-altitude areas, higher requirements are placed on the work and health of construction personnel, so the construction needs to be accelerated; due to the uneven settlement of pile foundations and foundations caused by freeze-thaw, settlement or uplift of soil or rock around the foundation pit, etc., a new pile foundation structure and construction plan have been studied and improved.

[0053] When constructing the pile foundation structure, firstly, the pile foundation pit is excavated by laying out the lines. Since the area is located in the high sea wave frozen soil area, the construction pit is generally a deep pit. At the bottom of the excavated pile foundation pit, several pile holes for pile foundation construction are excavated, and pile foundation steel cages 1 are placed in the pile holes. According to the bearing capacity requirements of the construction design, the tops of some of the pile foundation steel cages 1 (pile foundations) are connected to the foundation pit foundation bottom plate 2 through the pre-embedded connectors at the top of the steel cage, and the side walls of the foundation pit foundation bottom plate 2 are connected to the surrounding purlins 3 constructed on the side walls of the foundation pit through the pre-embedded connectors on the side walls; the upper part of the pile foundation steel cage 1 is connected with a reinforced support structure that can be deployed.

[0054] In the embodiment, a pile foundation steel cage 1 is specifically used as an example to illustrate by connecting the top embedded part of the steel cage with the foundation bottom plate 2 of the foundation pit:

[0055] By adjusting and controlling the supporting structure of the connection pair on the pile foundation steel cage 1 to be carried out at the designed position in the pile foundation hole, concrete is poured into the pile foundation hole to the top of the pile foundation steel cage 1, and a part of the lower structure of the pre-embedded connector at the top of the steel cage is connected to the steel bars exposed on the top surface of the pile foundation steel cage 1, and the concrete is poured integrally, which is equivalent to pre-embedding the lower part of the pre-embedded connector at the top of the steel cage on the top of the poured pile foundation. Then, the pre-embedded connector at the top of the steel cage is connected and stabilized with the steel skeleton of the foundation pit bottom plate 2, and the outer wall of the pre-embedded connector at the top of the steel cage is wrapped with more than two layers of waterproof roll material, and then the side wall pre-embedded connector is pre-embedded and connected at a certain distance (designed and calculated position) on the side wall of the foundation pit bottom plate 2, and the side wall pre-embedded connector is connected to the surrounding purlin 3 of the soil body around the foundation pit, and then the concrete of the foundation pit bottom plate 2 is poured, so that the foundation pit bottom plate 2 of the foundation pit foundation is connected to the pile foundation construction as a whole, and the whole is stressed.

[0056] Example 2

[0057] Based on Example 1, Figures 2 to 8As shown, the reinforced support structure of the arrangement includes a movable steel bar ring 11; the movable steel bar ring 11 is connected to a plurality of movable sleeves 12 connected to the movable steel bar ring 11, and the movable sleeves 12 can be raised and lowered and movably sleeved on the vertical main reinforcement of the pile foundation steel bar cage 1; the movable steel bar ring 11 is also connected to a plurality of sliding connection sleeves 13 arranged through the center, and the hollow cavity of the sliding connection sleeve 13 is used to pass the movable adjustable steel bar 14, and the end of the movable adjustable steel bar 14 close to the sliding connection sleeve 13 is bolted to the inner wall of the hollow cavity of the sliding connection sleeve 13, and the other end of the movable adjustable steel bar 14 is movably passed through the movable limiting steel ring and leaked on the top surface of the pile foundation steel bar cage 1, and the movable limiting steel ring is welded to the steel bar of the pile foundation steel bar cage 1, and is used to movably guide the movable adjustable steel bar 14. At the same time, a hinged steel plate 15 is hinged at the bottom end of the sliding connection sleeve 13 near the pile foundation borehole wall through a hinge seat, and one end of the hinged steel plate 15 away from the sliding connection sleeve 13 is hinged to the middle of the support steel plate 16 through a hinge seat, and the top of the support steel plate 16 is hinged to the stirrup of the pile foundation steel cage 1 through the hinge seat. According to the design requirements, the pile foundation steel cage 1 of the pile foundation is tied and constructed, and according to the design, the movable steel ring 11 is installed and connected at the designed position of the pile foundation steel cage 1, and the movable steel ring 11 is set at the designed installation position of the pile foundation steel cage 1 through the sliding connection sleeve 13, and can be raised and lowered. The pile foundation steel cage 1 is hoisted and placed in the corresponding pile foundation hole. Since the pile foundation steel cage 1 is different from the original pile foundation and is equipped with a deployable reinforcing support structure, when drilling the pile foundation, it is necessary to perform a certain hole expansion when the drilling depth is designed, that is, to perform appropriate hole expansion at a certain depth of the corresponding pile foundation drilling hole, so that the reinforcing support structure can be in the hole expansion area after it is expanded. After the pile foundation steel cage 1 of the pile foundation is lowered into the hole, the movable adjusting steel bar 14 is rotated. In order to ensure that the movable steel bar ring 11 moves vertically along the pile foundation steel cage 1, at least two movable adjusting steel bars 14 are provided, and two people rotate the movable adjusting steel bars 14 controlled by each other at the same time; the movable steel bar ring 11 is driven to move downward by the movable adjusting steel bar 14, so that the movable steel bar ring 11 drives each sliding connection sleeve 13 to move downward with the movable steel bar ring 11, so that the sliding connection sleeve 13 and the hinged steel plate 15 push the support steel plates 16 respectively hinged to the pile foundation hole expansion area through the hinged steel plate 15, so that each support steel plate 16 is in the expansion area. Then, the pile foundation concrete is poured into the pile foundation hole to the designed pile top position. Because a reinforced support is set in the middle position of the pile foundation hole, after the reinforced support is unfolded, it is equivalent to adding a "variable cross-section to increase the contact area" in the middle position of the pile foundation, thereby increasing the contact area and friction between the pile foundation and the surrounding soil, thereby increasing the support stability of the pile foundation.

[0058] Example 3

[0059] In an embodiment, Figures 9 and 10 As shown, the embedded connector at the top of the steel cage used to connect the pile foundation and the foundation bottom plate 2 of the foundation pit includes a connecting base 21, and the steel bars at the top of the pile foundation steel cage 1 (the steel bars exposed on the top surface of the pile foundation cast by the pile foundation steel cage 1) are extended and placed in the connecting base 21, and are cast and formed integrally with the concrete of the connecting base 21; a plurality of base steel bars 211 are connected to the top of the connecting base 21, and the plurality of base steel bars 211 extend into the steel skeleton of the foundation bottom plate 2 of the foundation pit and are connected to the steel skeleton of the foundation bottom plate 2 of the foundation pit; at the same time, a movable connecting seat 22 is movably connected to the top of the connecting base 21, and a plurality of bottom plate connecting ribs 221 are connected to the top of the movable connecting seat 22, and the bottom plate connecting ribs 221 also extend into the steel skeleton of the foundation bottom plate 2 of the foundation pit and are connected to the steel skeleton of the foundation bottom plate 2 of the foundation pit. The pre-embedded connector at the top of the pile foundation steel cage 1 of the pile foundation is poured together with the concrete of the foundation pit bottom plate 2, so that the pre-embedded connector at the top of the steel cage is connected to the foundation pit bottom plate 2 as a "whole" (since there is a construction joint at the construction site between the pre-embedded connector at the top of the steel cage and the foundation pit bottom plate 2, it is not a truly integrated structure). The bottom end of the movable connecting seat 22 is connected to the connecting base 21 through the base double-headed ball joint structure 23, so that the movable connecting seat 22 and the connecting base 21 have a certain degree of "activity".

[0060] In the embodiment, the base double-headed ball joint structure 23 includes a first base ball head and a second base ball head, and the first base ball head is connected to the second base ball head via a connecting column; one end of the first base ball head away from the second base ball head is movably connected to the first base ball head seat, and the first base ball head seat is arranged and installed in the movable connecting seat 22; one end of the second base ball head away from the first base ball head is movably connected to the second base ball head seat, and the second base ball head seat is arranged and installed in the connecting base 21; the movable connecting seat 22 and the connecting base 21 are movably connected by the base double-headed ball joint structure 23; and in order to ensure the movable When the movable connecting seat 22 and the connecting base 21 are moving, they can move horizontally within a certain small range, and ensure that the root pile foundation is still reliably connected to the foundation pit base plate 2 to bear the upper foundation load. A circle of connecting bosses 222 are connected to the end of the movable connecting seat 22 close to the connecting base 21, and the outer wall of the connecting bosses 222 is connected to a movable sliding block arranged toward the outer wall of the connecting base 21; a circle of movable grooves are provided at the end of the connecting base 21 close to the movable connecting seat 22, and the connecting bosses 222 are movably placed in the movable grooves; the bottom of the movable grooves is provided with movable limiting sliding grooves for movable limiting movable sliding blocks. In this way, the movable connecting seat 22 and the connecting base 21 are in a flexible and small range of movement, while ensuring the integrity of the pre-embedded connector at the top of the pile foundation steel cage 1 of the root pile foundation and the foundation pit base plate 2. Since the pre-embedded connector at the top of the pile foundation steel cage 1 of the root pile foundation is in a "slightly movable" state with the foundation pit base plate 2, it can reduce or weaken the "shear stress" caused by the uneven settlement of the foundation soil at the bottom of the foundation pit base plate 2 due to the frost heave and thaw of the frozen soil, and the damage to the connection between the root pile foundation and the foundation pit base plate 2, thereby reducing the "shear stress" caused by the uneven settlement of the foundation soil at the bottom of the foundation pit base plate 2 due to the frost heave and thaw of the frozen soil, and the cracking or breaking of the plate. It should be noted that during construction, this type of pile foundation adopts "three inserts and one insert" and is arranged in an "S-shaped" manner, that is, a pile foundation structure is set every certain number and distance of pile foundations, so as to ensure the stability and safety of the entire foundation pit foundation.

[0061] Example 4

[0062] In an embodiment, Figure 11 to Figure 12 As shown, in order to ensure the stability and deformation damage of the entire foundation pit, the side wall of the foundation pit base plate 2 is connected to the surrounding purlin 3 constructed on the side wall of the foundation pit through the side wall pre-embedded connector, and the foundation pit base plate 2 and the surrounding purlin 3 are "flexibly connected" through the side wall pre-embedded connector, so as to reduce the "shear stress" damage caused by uneven settlement. Take the side wall pre-embedded connector of the side wall pre-embedded connection of one of the foundation pit base plates 2 and the surrounding purlin 3 constructed on the side wall of the foundation pit as an example:

[0063] The side wall embedded connector of the design includes a side wall connecting seat 31 embedded and connected to the side wall of the foundation bottom plate of the foundation pit; the end of the side wall connecting seat 31 close to the surrounding purlin 3 is movably connected to the surrounding purlin 3 through the surrounding purlin double-headed ball joint structure 32; the surrounding purlin double-headed ball joint structure 32 includes a first surrounding purlin ball head and a second surrounding purlin ball head, and the first surrounding purlin ball head is connected to the second surrounding purlin ball head through a second ball rod connecting column; the end of the first surrounding purlin ball head away from the second surrounding purlin ball head is movably connected to the first surrounding purlin ball head seat, and the first surrounding purlin ball head seat is installed in the side wall connecting seat 31; the end of the second surrounding purlin ball head away from the first surrounding purlin ball head is movably connected to the second surrounding purlin ball head seat Dynamic connection, the second purlin ball head seat is arranged and installed in the purlin 3; the purlin 3 is "flexibly" connected with the side wall connection seat 31 through the purlin double-headed ball hinge structure 32, and the side wall connection seat 31 is pre-embedded in the concrete poured on the foundation pit bottom plate 2, thereby realizing the connection between the purlin 3 and the foundation pit bottom plate 2 through the purlin double-headed ball hinge structure 32, and the horizontal deformation force and "shear stress" of the entire foundation are transmitted to the surrounding soil or rock through the purlin 3, so as to reduce the horizontal connection of the foundation pit and reduce the cracking or fracture of the foundation pit caused by the horizontal "shear stress" of the foundation pit.

[0064] At the same time, the outer wall of the second ball bar connection column is provided with a movable telescopic sleeve 33 which can be telescopically set; one end of the movable telescopic sleeve 33 is connected to the surrounding purlin 3, and the other end of the movable telescopic sleeve 33 is connected to the side wall connection seat 31; and a high-strength deformation spring 34 is provided between the movable telescopic sleeve 33 and the second ball bar connection column, and the high-strength deformation spring 34 is passed through the second ball bar connection column, one end of the high-strength deformation spring 34 is connected to the surrounding purlin 3, and the other end of the high-strength deformation spring 34 is connected to the side wall connection seat 31. The movable telescopic sleeve 33 is used to protect the high-strength deformation spring 34 which is set between the movable telescopic sleeve 33 and the second ball bar connection column and telescopically sleeved on the second ball bar connection column, and the high-strength deformation spring 34 is used to make the side wall connection seat 31 pre-buried and connected to the side wall of the foundation bottom plate 2 of the foundation pit relatively movable and deformable with the surrounding purlin 3, and plays a role of flexible protection.

[0065] Further, based on the fourth embodiment, a movable hinge structure is provided between the purlin 3 and the side wall connection seat 31; the movable hinge structure includes a first movable hinge frame 35 and a second movable hinge frame 36; the first movable hinge frame 35 and the second movable hinge frame 36 are rotatably hingedly connected at one end close to each other through a hinge shaft; the first movable hinge frame 35 is hingedly connected to the side wall connection seat 31 at one end away from the second movable hinge frame 36 through a hinge seat; the second movable hinge frame 36 is hingedly connected to the purlin 3 at one end away from the first movable hinge frame 35 through a hinge seat. A movable telescopic connecting steel bar 37 is also pre-embedded and connected around one end of the side wall connection seat 31 close to the purlin 3, and the other end of the movable telescopic connecting steel bar 37 is movably inserted into the movable steel bar shaft sleeve, and the movable steel bar shaft sleeve is pre-embedded and connected in the purlin 3. In a specific embodiment, the additional movable hinge structure further "movably" connects the purlin 3 and the side wall connecting seat 31, which not only ensures the overall connection between the two, but also reduces the deformation damage caused by the horizontal shear stress of the foundation pit (foundation cracking or fracture, uneven settlement of the foundation pit, etc.); and, when the foundation pit undergoes horizontal displacement, the movable telescopic connecting steel bar 37 "moves", thereby reducing the cracking or fracture of the foundation pit (foundation bottom plate) caused by "shear stress". It should be noted here that the construction position of the purlin 3 and the side wall of the foundation pit bottom plate 2 belongs to the key construction node (construction joint), so it is necessary to carry out the construction according to the key construction node requirements during construction, so as to ensure the quality requirements of the construction joints of the two. Since the key construction joint is not the focus of the introduction and protection of this application, its construction steps and implementation methods are not described in detail.

[0066] In this regard, through the entire construction implementation method, the pile foundation structure of this application is different from the traditional pile foundation construction. The structure of the pile foundation of this construction can increase the support limit and friction force with the pile foundation hole of the construction, and reduce the sinking of the pile foundation caused by the load of the upper foundation pit bottom plate structure; at the same time, the top of the pile foundation formed by the cast steel cage of the pile foundation is connected to the foundation pit bottom plate through the pre-embedded connector at the top of the steel cage, and the pre-embedded connector at the top allows the foundation pit foundation bottom plate and the top of the formed pile foundation to maintain a certain degree of mobility, so that when the soil or rock mass of the foundation pit foundation bottom plate causes the fracture and settlement of the foundation pit foundation bottom plate due to frost heave or thaw settlement, the shear failure resistance of the foundation pit foundation bottom plate is improved; and, at the foundation pit foundation bottom plate The side wall is connected to the purlin 3 constructed on the side wall of the foundation pit through the side wall embedded connecting parts, so that the foundation pit foundation floor plate is connected to the purlin 3, which is subjected to overall force and has a certain movable deformation space, thereby reducing the fracture or cracking of the foundation pit foundation floor plate due to deformation of the foundation soil or rock mass and shear stress, and allowing the foundation pit foundation floor plate and the soil around the foundation pit to sink appropriately with the foundation soil or rock mass while maintaining support, without causing large tension to the surrounding soil or rock and soil, thereby causing the soil or rock and soil around the construction pit to sink or bulge, affecting the upper main construction structure or surrounding buildings.

Claims

1. A seasonal pile foundation structure for high altitude areas, including an excavated pile foundation pit, characterized in that: A plurality of pile holes for constructing pile foundations are excavated at the bottom of the pile foundation pit, and pile foundation steel cages are placed in the pile holes. The top of the pile foundation steel cage is connected to the foundation pit bottom plate through a pre-embedded connector at the top of the steel cage, and the side wall of the foundation pit bottom plate is connected to the surrounding purlin constructed on the side wall of the foundation pit through a pre-embedded connector on the side wall; The pile foundation steel cage is connected with a deployable reinforcement support structure; The reinforced support structure includes a movable steel bar collar; The movable steel bar ring is connected to a plurality of movable sleeves connected to the movable steel bar ring, and the movable sleeves can be raised and lowered and are arranged on the vertical main bars of the pile foundation steel bar cage; The movable steel bar sleeve ring is also connected to a plurality of sliding connection sleeves arranged through the center, and the hollow cavity of the sliding connection sleeve is used to penetrate the movable adjustment steel bar, and one end of the movable adjustment steel bar close to the sliding connection sleeve is connected to the inner wall of the hollow cavity of the sliding connection sleeve by bolts, and the other end of the movable adjustment steel bar movably passes through the movable limiting steel ring and leaks on the top surface of the pile foundation steel bar cage, and the movable limiting steel ring is welded to the steel bar of the pile foundation steel bar cage, and is used for movably guiding the movable adjustment steel bar; The bottom end of the sliding connection sleeve on one side close to the pile foundation borehole wall is hinged with a hinged steel plate through a hinge seat, the end of the hinged steel plate away from the sliding connection sleeve is hinged to the middle of the support steel plate through the hinge seat, and the top end of the support steel plate is hinged to the stirrup of the pile foundation steel cage through the hinge seat; The pre-embedded connector at the top of the steel cage includes a connection base, and the steel bars at the top of the pile foundation steel cage are extended and placed in the connection base, and are integrally cast with the concrete of the connection base; A plurality of base steel bars are connected around the top of the connection base, and the plurality of base steel bars extend into the steel bar skeleton of the foundation pit bottom plate and are connected to the steel bar skeleton of the foundation pit bottom plate; The top of the connecting base is movably connected to a movable connecting seat, and the top of the movable connecting seat is connected to a plurality of bottom plate connecting ribs, and the bottom plate connecting ribs also extend into the steel frame of the foundation pit bottom plate and are connected to the steel frame of the foundation pit bottom plate; The side wall embedded connector includes a side wall connector seat embedded in the side wall of the foundation pit foundation bottom plate; One end of the side wall connecting seat close to the purlin is movably connected to the purlin through the purlin double-end ball joint structure; The double-headed ball joint structure of the surrounding purlin includes a first surrounding purlin ball head and a second surrounding purlin ball head, wherein the first surrounding purlin ball head and the second surrounding purlin ball head are connected via a second ball rod connecting column; One end of the first purlin ball head away from the second purlin ball head is movably connected to the first purlin ball head seat, and the first purlin ball head seat is arranged and installed in the side wall connecting seat; One end of the second surrounding purlin ball head away from the first surrounding purlin ball head is movably connected to the second surrounding purlin ball head seat, and the second surrounding purlin ball head seat is arranged and installed in the surrounding purlin.

2. The seasonal pile foundation structure for high altitude areas according to claim 1, characterized in that: The bottom end of the movable connection seat is connected to the connection base through a double-headed ball joint structure of the base; The base double-headed ball joint structure comprises a first base ball head and a second base ball head, and the first base ball head and the second base ball head are connected via a connecting column; One end of the first base ball head away from the second base ball head is movably connected to the first base ball head seat, and the first base ball head seat is arranged and installed in the movably connected seat; One end of the second base ball head away from the first base ball head is movably connected to the second base ball head seat, and the second base ball head seat is arranged and installed in the connecting base.

3. The seasonal pile foundation structure for high altitude areas according to claim 2, characterized in that: The movable connection seat is connected to a circle of connecting bosses at one end close to the connecting base, and the outer wall of the connecting bosses is connected to a movable sliding block arranged toward the outer wall of the connecting base; The connecting base has a circle of movable grooves at one end close to the movable connecting seat, and the connecting boss is movably placed in the movable grooves; The bottom end of the movable groove is provided with an movable limiting sliding groove for the movable sliding block.

4. The seasonal construction pile foundation structure for high altitude areas according to claim 1, characterized in that: The outer wall of the second club connecting column is provided with a telescopic movable telescopic sleeve; One end of the movable telescopic sleeve is connected to the surrounding purlin, and the other end of the movable telescopic sleeve is connected to the side wall connecting seat; A high-strength deformation spring is arranged between the movable telescopic sleeve and the second ball rod connecting column. The high-strength deformation spring is passed through the second ball rod connecting column. One end of the high-strength deformation spring is connected to the surrounding purlin, and the other end of the high-strength deformation spring is connected to the side wall connecting seat.

5. The seasonal pile foundation structure for high altitude areas according to claim 4, characterized in that: A movable hinge structure is provided between the surrounding purlin and the side wall connecting seat; The movable hinge structure comprises a first movable hinge frame and a second movable hinge frame; The first movable hinge and the second movable hinge are rotatably hingedly connected at their ends close to each other via a hinge shaft; One end of the first movable hinge away from the second movable hinge is hinged to the side wall connecting seat through a hinge seat; One end of the second movable hinge away from the first movable hinge is hinged to the surrounding purlin through a hinge seat.

6. The seasonal pile foundation structure for high altitude areas according to claim 5, characterized in that: The side wall connecting seat is pre-embedded with movable telescopic connecting steel bars around one end close to the surrounding purlin, and the other end of the movable telescopic connecting steel bar can be movably inserted into the movable steel bar shaft sleeve, and the movable steel bar shaft sleeve is pre-embedded and connected in the surrounding purlin.

Images