Automatic leveling detachable steel casing device for single-pile bearing capacity test

Abstract

The utility model relates to an automatic-leveling detachable steel casing device for a single-pile bearing capacity test. The automatic leveling detachable single pile bearing capacity test steel casing device comprises a steel casing arranged outside the top of a single pile in a sleeving mode. The top end of the steel casing is higher than that of the single pile; an annular pouring cavity is formed between the inner wall of the steel casing and the side face of the top of the single column. And a disc-shaped pouring cavity is arranged in the steel casing and above the single pile. According to the utility model, a concrete pouring object can be provided in a pouring manner; the top surface of the concrete pouring object is automatically leveled and is used as a force application surface, so that a loading counter-force system of the static load tester can apply force conveniently; the bottom of the concrete pouring object wraps the top end of the single pile to protect the single pile; and the steel casing can be drawn out after being poured and can be recycled.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pile static load test, in particular to a kind of automatic stable detachable single pile bearing capacity test steel casing device. BACKGROUND

[0002] Pile static load test is a kind of test method for determining single pile vertical compressive ultimate bearing capacity in building field.Pile static load test equipment of common piece is static load testing instrument.The static load testing instrument includes loading reaction system, load test system, displacement test system, instrument control acquisition system.The loading reaction system applies force to the top of pile;The load test system is used to measure the performance of pile under stress;Displacement test system is used to measure the settlement or displacement of the top of pile;Instrument control acquisition system is used to control the static load test process and collect test data.In prior art, before pile static load test, the upper end of pile needs to be ground to provide a horizontal force surface, which is convenient for loading reaction system to apply force.However, common pile is mostly reinforced concrete material, which has great strength and hardness;Grinding operation is large in amount and difficult;On the other hand, grinding treatment is easy to cause structural hazards of pile, which is not conducive to accurate measurement of pile static load test. SUMMARY

[0003] The utility model aims at solving above-mentioned problem, provide a kind of automatic stable detachable single pile bearing capacity test steel casing device.

[0004] The utility model discloses a kind of automatic stable detachable single pile bearing capacity test steel casing device, including the steel casing of being sleeved in the top of single pile;The top of the steel casing is higher than the top of single pile;Annular pouring cavity is equipped between the inner wall of the steel casing and single column top side;Steel casing, single pile upper side is equipped with disc-shaped pouring cavity;Annular pouring cavity and disc-shaped pouring cavity are used for pouring;Disc-shaped pouring cavity upper side is pouring opening;The lower end of steel casing is in contact with the bottom of foundation pit, and the concrete of pouring is blocked;After pouring, steel casing is extracted, and the top of single pile forms hat-shaped concrete pouring;The top surface of the concrete pouring becomes horizontal and smooth because of the automatic flow of concrete, as force surface, so as to facilitate the loading reaction system of static load testing instrument to apply force.

[0005] Preferably, the steel casing is a circular sleeve, so that the steel casing has no specific direction of placement, simplifying the use of the device.

[0006] Preferably, the steel casing includes two housings with semicircular horizontal cross sections; the left and right ends of the housings extend radially outward to form ear plates; the two housings are combined to form a complete circular ring; the ear plates of the two housings are in close contact; the ear plates provide stable operating ends for easy transportation of the steel casing; and the two housings are easier to machine, reducing the manufacturing cost of the housings.

[0007] Further, the steel casing further comprises a plurality of bolt-nut combinations; the bolt-nut combinations connect the ears of the two housings, so that the two housings are detachably connected, and when the steel casing cannot be pulled out, the steel casing can be directly disassembled into two housings.

[0008] Further, the plurality of bolt-nut combinations are symmetrically arranged about the front and back of the steel casing, so that the front and back ends of the steel casing have corresponding connection strength, and the overall stability of the steel casing is ensured.

[0009] Preferably, the automatic leveling detachable single pile bearing capacity test steel casing device further comprises a buried soil layer; the buried soil layer covers the lower end of the steel casing and seals the lower end of the steel casing to prevent the poured concrete from being exposed from the lower end of the steel casing.

[0010] Further, the top of the buried soil layer is provided with a circular rammed area centered on the steel casing; the soil density below the rammed area is much greater than that of other areas, and has better concrete sealing properties.

[0011] Preferably, the bottom end of the steel casing is provided with at least two positioning grooves; the positioning grooves penetrate through the bottom end of the steel casing; the single pile is provided with a positioning steel bar at a position corresponding to the positioning grooves; the positioning grooves and the positioning steel bar cooperate to limit the vertical position of the upper end of the steel casing, so as to facilitate the formation of the disc-shaped pouring cavity.

[0012] Further, the positioning grooves penetrate through the bottom end of the steel casing along the radial direction of the steel casing; the positioning steel bar is also arranged along the radial direction of the single pile; in this way, both the positioning grooves and the positioning steel bar are relatively easy to process.

[0013] Further, the positioning grooves are arranged along the axial direction of the steel casing, so that the steel casing can be installed or pulled out along its axial direction, simplifying the disassembly process of the steel casing.

[0014] Further, the positioning grooves are arranged along the axial direction of the steel casing, so that the steel casing can be installed or pulled out along its axial direction, simplifying the disassembly process of the steel casing.

[0015] The automatic leveling detachable single pile bearing capacity test steel casing device of the utility model has the following advantages:

[0016] (1) The steel casing device of the utility model can provide a concrete pouring object in the form of pouring; the top surface of the concrete pouring object is automatically leveled and serves as a force application surface to facilitate the force application of the loading reaction system of the static load tester; the bottom of the concrete pouring object wraps the top end of the single pile to protect the single pile; and the steel casing can be pulled out after pouring and reused repeatedly.

[0017] (2) The buried soil layer seals the lower end of the steel casing to prevent the poured concrete from being exposed from the lower end of the steel casing;

[0018] (3) The positioning groove cooperates with the positioning steel bar to limit the vertical position of the upper end of the steel casing, so as to facilitate the formation of the disc-shaped pouring cavity. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a working state diagram of the automatic self-leveling detachable single pile bearing capacity test steel casing device of the utility model;

[0020] Figure 2 is a top view of Figure 1 ;

[0021] Figure 3 is an A-A sectional view of Figure 2 ;

[0022] Figure 4 is an I enlarged view of Figure 3 ;

[0023] Figure 5 is a perspective view of the automatic self-leveling detachable single pile bearing capacity test steel casing device of the utility model;

[0024] Figure 6 is a front view of Figure 5 ;

[0025] Figure 7 is a B-B sectional view of Figure 6 ;

[0026] In the drawing: 00. Foundation pit, 01. Single pile, 011. Positioning steel bar, 02. Concrete pouring, 03. Steel casing, 11. Annular pouring cavity, 12. Disc-shaped pouring cavity, 13. Shell, 131. Ear plate, 14. Positioning groove, 2. Bolt and nut combination, 3. Buried soil layer, 31. Rammed area.

[0027] 1. Steel casing, 11. Annular pouring cavity, 12. Disc-shaped pouring cavity, 13. Shell, 131. Ear plate, 14. Positioning groove, 2. Bolt and nut combination, 3. Buried soil layer, 31. Rammed area. DETAILED DESCRIPTION

[0028] Example one: refer to Figures 1-7The utility model provides an automatic level -adjusting detachable single pile bearing capacity test steel casing device, including the steel casing 1 of the single pile 01 top outside set, the steel casing 1 top end is higher than the single pile 01 top end, the annular pouring cavity 11 is established between the inner wall of steel casing 1 and single column top side, and the disc -shaped pouring cavity 12 is established in the steel casing 1, above single pile 01, and the annular pouring cavity 11 and disc -shaped pouring cavity 12 are used for pouring, and the disc -shaped pouring cavity 12 is above pouring opening, and the steel casing 1 lower end is with the bottom of foundation pit 00 and is opposite, and the concrete of pouring is blocked, after pouring, the steel casing 1 is extracted, and the single pile 01 top end forms the concrete pouring 02 of hat type, and the concrete pouring 02 top surface becomes horizontal flat because of the automatic flow -leveling of concrete, as the force application surface, to facilitate the loading reaction system force application of static load testing instrument.

[0029] Compared with the prior art, the utility model can provide a concrete pouring 02 by the form of pouring, the concrete pouring 02 top surface is automatically leveled, as the force application surface, to facilitate the loading reaction system force application of static load testing instrument, the concrete pouring 02 bottom wraps the single pile 01 top end, and the single pile 01 is protected, and the steel casing 1 can be extracted after pouring, and the repeated circulation is used.

[0030] The steel casing 1 is a circular sleeve, so that the placing direction of the steel casing 1 has no requirement, and the use process of the device is simplified.

[0031] The steel casing 1 includes two housings 13 with semicircular rings as horizontal sections, the left and right ends of the housings 13 extend outward in the radial direction to form ear plates 131, the two housings 13 are spliced into a complete ring, the ear plates 131 of the two housings 13 are in close contact, the ear plates 131 provide stable operation ends to facilitate the back-and-forth carrying of the steel casing 1, and the machining of the two housings 13 is relatively easy, so that the manufacturing cost of the housings 13 can be reduced.

[0032] The steel casing 1 further includes a plurality of bolt-nut combinations 2, the bolt-nut combinations 2 connect the ear plates 131 of the two housings 13 to each other, so that the two housings 13 are detachably connected, and when the steel casing 1 cannot be extracted, the steel casing 1 can be directly disassembled into the two housings 13.

[0033] The plurality of bolt-nut combinations 2 are symmetrically arranged about the front and back of the steel casing 1, so that the front and back ends of the steel casing 1 have corresponding connection strengths, and the overall stability of the steel casing 1 is ensured. In the embodiment, there are 18 bolt-nut combinations 2.

[0034] The automatic level-adjusting detachable single pile bearing capacity test steel casing device further includes a buried soil layer 3, the buried soil layer 3 covers the lower end of the steel casing 1 to block the lower end of the steel casing 1, so that the poured concrete does not completely expose from the lower end of the steel casing 1.

[0035] The top of the buried soil layer 3 is provided with a circular rammed area 31 centered on the steel casing 1; the soil density below the rammed area 31 is much greater than that of other areas, and has better concrete sealing properties.

[0036] The bottom end of the steel casing 1 is provided with at least two positioning grooves 14; the positioning grooves 14 penetrate through the bottom end of the steel casing 1; the single pile 01 is provided with a positioning steel bar 011 at a corresponding position of the positioning grooves 14; the positioning grooves 14 and the positioning steel bar 011 cooperate to limit the vertical position of the upper end of the steel casing 1, facilitating the formation of the disc-shaped pouring cavity 12.

[0037] The positioning grooves 14 penetrate through the bottom end of the steel casing 1 along the radial direction of the steel casing 1; the positioning steel bar 011 is also arranged along the radial direction of the single pile 01; in this way, both the positioning grooves 14 and the positioning steel bar 011 are relatively easy to process.

[0038] The positioning grooves 14 are arranged along the axial direction of the steel casing 1, so that the steel casing 1 can be installed or extracted along its axial direction, simplifying the disassembly process of the steel casing 1.

[0039] There are four positioning grooves 14 in this embodiment; each shell 13 has two positioning grooves 14; and the positioning grooves 14 on each shell 13 are arranged at the same position; the shells 13 are of the same shape and can be uniformly processed, saving manufacturing costs.

[0040] The working process of this embodiment is as follows: the steel casing 1 is fitted onto the top end of the single pile 01; the positioning grooves 14 are buckled onto the positioning steel bar 011; after the steel casing 1 is buckled and stabilized, the bottom of the foundation pit 00 is covered and buried, so that the buried soil layer 3 covers the bottom end of the steel casing 1; the top of the buried soil layer 3 exceeds the positioning grooves 14; the circular annular area around the steel casing 1 is rammed to form a circular annular rammed area 31. Concrete is poured from the upper end of the steel casing 1 into the interior of the steel casing 1 until the concrete submerges the top end of the single pile 01 by a certain distance; after waiting for the concrete to completely set, the top end of the single pile 01 forms a hat-shaped concrete pouring 02; after the steel casing 1 is extracted, the concrete pouring 02 can provide a horizontally flat top surface for pile static load testing.

[0041] The extracted steel casing 1 can be transferred to the interior of other foundation pits 00 to pour concrete pouring 02. Such a steel casing 1 can be repeatedly circulated; when the single pile 01 on which the concrete pouring 02 has been poured is subjected to pile static load testing, the single pile 01 in other foundation pits 00 can be subjected to concrete setting at the same time.

[0042] Embodiment two: Embodiment two is basically the same as embodiment one, and the same parts will not be repeated. The difference is that: the positioning groove 14 has at least three; the corresponding positioning steel bar 011 can stably support the steel casing 1; all the positioning grooves 14 are distributed relative to the circumference of the steel casing 1, so that the steel casing 1 is coaxial relative to the single pile 01, which is beneficial to the loading reaction force system of the static load tester.

Claims

1. An automatically leveling and detachable steel casing device for testing the bearing capacity of a single pile, comprising a steel casing fitted over the top of the single pile; characterized in that, The top of the steel casing is higher than the top of the single pile; an annular casting cavity is provided between the inner wall of the steel casing and the side of the top of the single pile; inside the steel casing, a disc-shaped casting cavity is provided above the single pile.

2. The automatic leveling and detachable single-pile bearing capacity test steel casing device according to claim 1, characterized in that: The steel casing is a circular sleeve.

3. The automatic leveling and detachable single-pile bearing capacity test steel casing device according to claim 1, characterized in that: The steel casing comprises two shells with a horizontal cross-section of semi-circular rings; ear plates extend radially outward from the left and right ends of the shells; the two shells are joined together to form a complete ring; the ear plates of the two shells are tightly connected.

4. The automatic leveling and detachable single-pile bearing capacity test steel casing device according to claim 3, characterized in that: The steel casing also includes several bolt and nut assemblies; the bolt and nut assemblies connect the lugs of the two shells.

5. The automatic leveling and detachable single-pile bearing capacity test steel casing device according to claim 1, characterized in that: It also includes a burial soil layer; this burial soil layer covers the lower end of the steel casing.

6. The automatic leveling and detachable single-pile bearing capacity test steel casing device according to claim 5, characterized in that: The top of the buried soil layer is equipped with a compacted ring centered on a steel casing.

7. The automatic leveling and detachable single-pile bearing capacity test steel casing device according to claim 1, characterized in that: The bottom end of the steel casing is provided with at least two positioning grooves; the positioning grooves penetrate the bottom end of the steel casing; a positioning steel bar is provided at the position corresponding to the positioning groove of the single pile; the positioning groove and the positioning steel bar cooperate with each other.

8. The automatic leveling and detachable single-pile bearing capacity test steel casing device according to claim 7, characterized in that: The positioning groove extends radially through the bottom of the steel casing.

9. The automatically leveling and detachable single-pile bearing capacity test steel casing device according to claim 7 or 8, characterized in that: The positioning groove is set along the axial direction of the steel casing.

10. The automatically leveling and detachable single-pile bearing capacity test steel casing device according to claim 9, characterized in that: There are at least three positioning slots; all positioning slots are distributed circumferentially relative to the steel casing.

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