CN103031860B - Pipe pile vertical static load testing connection device, and testing system and method using same - Google Patents
Pipe pile vertical static load testing connection device, and testing system and method using same Download PDFInfo
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- CN103031860B CN103031860B CN201210545325.9A CN201210545325A CN103031860B CN 103031860 B CN103031860 B CN 103031860B CN 201210545325 A CN201210545325 A CN 201210545325A CN 103031860 B CN103031860 B CN 103031860B
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Abstract
The invention discloses a pipe pile vertical static load testing connection device, which mainly comprises vertical connecting rods and a clamp for clamping the pile head of a pipe pile, wherein the lower ends of the connecting rods are connected to the clamp; the upper ends of the connecting rods are used for connecting a counterforce loading device positioned above the pipe pile; in an anti-pulling test, the pipe pile is taken as a test pipe pile, and upward pulling force is transmitted to the test pipe pile through the friction acting force between the clamp and the test pipe pile; or in a compression test, the pipe pile comprises a test pipe pile and at least two pairs of anchor piles which are symmetrically positioned on the periphery of the test pipe pile, and counterforce is applied to the test pipe pile in a balanced way through the friction acting force between the clamp and the anchor piles. The invention further discloses a testing system and method using the connection device. The pipe pile vertical static load testing connection device, the testing system and the method are suitable for the anti-pulling test and the compression test, and have high universality; and the pipe pile vertical static load testing connection device is convenient to install, is low in cost and has high safety, and various problems existing in the conventional connection method are solved, and technical support is provided for the realization of wide application of an anchor pile method in compression tests.
Description
Technical field
The invention belongs to pile foundation detection field, particularly relate to a kind of prestressed concrete pipe pile pile foundation vertical static loading test linkage, also relate to the pilot system using this linkage, separately relate to the test method of this system.
Background technology
Prestressed concrete pipe pile is a kind of tubular precast reinforced concrete piles adopting pretensioned prestressing technique and centrifugal formation method to make, at present, various types of prestressed concrete pipe pile has been widely used in building engineering, deepwater wharf structure, road and bridge engineering etc.In engineering construction, the bearing capacity of stake has become a very important technological means of Control Engineering quality, and pile foundation vertical static loading test be determine bearing capacity of pile foundation the most intuitively, the most reliable method.Prestressed concrete pipe pile pile foundation vertical static loading test comprises compressive static load test and resistance to plucking static loading test.
In pile tube resistance to plucking static loading test, need the prestressed concrete pipe pile carrying out pile tube resistance to plucking static loading test to be connected with experimental rig, existing connected mode has following several:
The first is that core method filled out by joint bar: at tubular pile head partial insertion reinforcing bar, then concreting fills out core, until concrete setting and after maintenance reaches design strength, reinforcing bar and the pressure-bearing bloom be placed on jack or steel case, girder steel is connected by the method for welding.The shortcoming of this method of attachment is: (1) necessary concreting, and the concrete curing time of water seasoning is long, is generally no less than 7 days; (2) carry out joint bar to pile tube and fill out core process, effort of taking a lot of work, material can not get recycling, and at the trial, some reinforcing bars may be pulled out, and cause test not carry out; (3) the welding quality of reinforcing bar not easily ensures.
The second is pile tube top drilling method: be uniformly distributed several boring perpendicular to pile body on tubular pile body top, steel pin or screw rod are set in the borehole, connecting steel wire ropes or reinforcing pull rod on steel pin or screw rod, and connect tubular pile body and counterforce device by wire rope or reinforcing pull rod.This method needs to hole on pile body, to pile tube existence destruction to a certain degree, cannot ensure pipe pile integrity.
The third is that flange connects synthesis: the pile for prestressed pipe pulling resistance testing device of employing comprises stake cylinder, upper straining beam, lower straining beam, girder and jack, and its king-pile cylinder and pile tube end plate pass through Flange joint.This apparatus structure is comparatively complicated, and installs inconvenience, adds the difficulty of pile tube resistance to plucking static loading test.
In pile tube compressive static load test, usually can load counterforce device on prestressed concrete pipe pile, load counterforce device and mainly comprise following two kinds of forms:
The first is ballasting platform counterforce device, namely adopts accumulation load method, needs to be deposited on bearing platform by disposable for heap weight before on-test, and preloading process exists potential safety hazard, and implementation cost is higher, and test time is long; In addition, " accumulation load method " requirement to test site is higher, if test site exists the situations such as narrow or geology is soft, " accumulation load method " then cannot be suitable for.
The second draws anchor device, namely the structural system of whole loading counterforce device is changed, to mainly improve in order to stressed simple tension and compression member system by the structural system of curved crossbeam composition, although adopting draws anchor device to optimize the structural system of counterforce device, oblique pulling easily makes the pile crown of pile tube destroy.
The third is anchor pile beam counterforce device, i.e. anchored pile-testing method, that several anchoring piles symmetrical around test pile are coupled together by dowel or other linkages and reaction frame, rely on the jack on stake top by reaction frame jack-up, there is provided counter-force by the anchoring pile be connected, provide the size of counter-force by reaction frame intensity and the uplift resistance decision being connected anchoring pile.The advantage of this method is: the use cost of anchor pile beam counterforce device is low, efficiency is high.But due to the method for attachment of the loading counterforce device and pile tube that cannot determine applicable engineer applied, this device is not yet applied in pile tube compressive static load test at present.
Summary of the invention
First object of the present invention is to provide that a kind of structure is simple, quick for installation, cost is lower, safety is high, require low, simultaneously can be applicable to pullout tests and compression test pile tube Vertical Static Loading Test linkage to test site.
Above-mentioned purpose of the present invention realizes by the following technical solutions: a kind of pile tube Vertical Static Loading Test linkage, it is characterized in that: it forms primarily of vertical connecting rod and the fixture for grip tube pile head, the lower end of described connecting rod is connected on described fixture, the upper end of described connecting rod is for being connected to the loading counterforce device be positioned at above pile tube, described in pullout tests, pile tube is test pile tube, by the friction force between fixture and test pile tube, uplift force is passed to test pile tube, or pile tube comprises test pile tube and at least two and is positioned to symmetry the anchoring pile testing pile tube periphery described in compression test, there is provided counter-force proportionality action in test pile tube by the friction force between fixture and anchoring pile.
Present invention achieves and in pullout tests, to test pile tube and load the connection of counterforce device or achieve anchoring pile in compression test and provide counter-force to act on test pile tube with the connection loading counterforce device, therefore, the present invention can be applicable to pullout tests and compression test, highly versatile simultaneously; The present invention can not destroy the pile body of pile tube, can ensure pipe pile integrity; That the present invention installs is convenient, cost is lower, safety is high, solves the various problems existed in Conventional attachment methods, when such as the present invention is used for pullout tests, instead of " core process filled out by joint bar ", the object reach the reduction of erection time, reducing costs; And during for compression test, " anchored pile-testing method " replacement " accumulation load method " using engineering pile as anchoring pile, provides technical support for realizing the extensive use of anchored pile-testing method in compression test.
As a modification of the present invention, described connecting rod and described fixture, load counterforce device and be all connected by detachable syndeton.
As one embodiment of the present invention, described detachable syndeton is screw connection structure, described fixture is sleeved on the tubular dop on tubular pile head primarily of close fitting and is located at the otic placode composition on dop outer wall, screw connection structure between described connecting rod and fixture comprises the screw be opened on described otic placode and the screw thread being located at described connecting rod lower end, and the lower end of described connecting rod forms connecting bolt through after described screw by nut is fixing.Fixture of the present invention and pile tube closely cooperate, and make to have enough frictional force therebetween, fully can guarantee bonding strength, provide uplift force and downforce for the power transmission that realizes in resistance to plucking and compression test for testing pile tube.
In order to realize closely cooperating of fixture and pile tube, as a further improvement on the present invention, described tubular dop is docked by two and half cylindrical shells and forms.
As a kind of preferred embodiment of the present invention, the interface of described two and half cylindrical shells has overhanging flank respectively, described flank is plate body and length direction along described half cylindrical shell extends, and the plate face of described flank has corresponding screw and form pile holder bolt by nut is fixing after passing for bolt.
Second object of the present invention is to provide a kind of pilot system using above-mentioned pile tube Vertical Static Loading Test linkage.
Above-mentioned purpose of the present invention realizes by the following technical solutions: a kind of pilot system using above-mentioned pile tube Vertical Static Loading Test linkage, is characterized in that: comprise described pile tube Vertical Static Loading Test linkage and load counterforce device; In pullout tests, described linkage joint test pile tube with load counterforce device and uplift force is passed to test pile tube; Or in compression test, described linkage connect load counterforce device with at least two to be symmetrically distributed in test pile tube periphery anchoring pile to provide counter-force proportionality action in testing pile tube.
As one embodiment of the present invention, buttress is comprised for the loading counterforce device in pullout tests, girder, loading blocks and short beam, described girder is across above described test pile tube and its two ends are positioned on described buttress, for placing lift-up device and making it be in directly over test pile tube on described girder, described loading blocks and short beam are superimposed on the end face of described lift-up device from bottom to top successively, the external part that loading blocks becomes short beam is stretched out at the two ends of described short beam respectively, the external part of described short beam is connected with described test connecting device to realize loading counterforce device and the connection testing pile tube.
As one embodiment of the present invention, girder is comprised for the loading counterforce device in compression test, secondary beam and short beam, for placing lift-up device on the end face of described test pile tube, described girder is across the top of described test pile tube and is pressed on lift-up device, described secondary beam at least makes its two ends be positioned at directly over described anchoring pile with the direction perpendicular to girder, then be pressed on girder in the middle part of secondary beam, described short beam is placed on described secondary beam, the external part that secondary beam becomes short beam is stretched out at the two ends of described short beam respectively, the external part of described short beam is connected the connection realizing loading counterforce device and anchoring pile with described test connecting device.
The preferred jack of described lift-up device, also can select other to have rigid top and lift the light little crane gear weighing thing function.
3rd object of the present invention is the test method providing a kind of above-mentioned pilot system.
Above-mentioned purpose of the present invention realizes by the following technical solutions: a kind of test method of above-mentioned pilot system, is characterized in that comprising the following steps:
(1) with 1.2 of maximum trial load times, the uplift resistance testing pile tube is checked, according to checking computation results Selection experiment linkage;
(2) the fixture close fitting of test connecting device is sleeved on the pile crown of test pile tube;
(3) lift girder, make it across the top being arranged on test pile tube, lift-up device is placed on girder, and be positioned at directly over test pile tube;
(4) on the end face of lift-up device, place loading blocks, then place short beam in loading blocks;
(5) the connecting rod jockey of service test linkage and the external part of short beam be fixed, pilot system installation;
(6) operate lift-up device, described test connecting device be evenly subject to uplift force and power transmission to testing pile tube, developmental tube pile is put to the test required maximum trial load.
As another embodiment of the invention, a kind of test method of above-mentioned pilot system, is characterized in that comprising the following steps:
(1) with 1.2 of maximum trial load times, choose anchoring pile according to construction plant condition, determine the design uplift resistance of every root anchoring pile, and the uplift resistance of anchoring pile is checked, according to checking computation results Selection experiment linkage;
(2) the fixture close fitting of test connecting device is sleeved on the pile crown of anchoring pile;
(3) lift-up device is placed on the end face of test pile tube;
(4) lift girder, make it across the top being arranged on test pile tube and be pressed on lift-up device, to be placed on girder by secondary beam perpendicular to girder direction, and making anchoring pile at least be positioned at immediately below secondary beam two ends;
(5) at least on the two ends of secondary beam, place short beam;
(6) the connecting rod jockey of service test linkage and the external part of short beam be fixed, forms reaction frame, pilot system installation;
(7) operate lift-up device, the stressed jack-up of reaction frame, test connecting device is evenly subject to uplift force, anchoring pile counter-force is provided and proportionality action in test pile tube, developmental tube pile is put to the test required maximum trial load.
Compared with prior art, the present invention has following significant effect:
(1) present invention achieves and in pullout tests, to test pile tube and the connection loading counterforce device and uplift force is passed to test pile tube, achieve the connection of anchoring pile and loading counterforce device in compression test simultaneously and provide counter-force proportionality action in testing pile tube, therefore, the present invention can be applicable to pullout tests and compression test simultaneously, highly versatile, convenient and practical.
(2) the present invention adopts holder pile tube, can not destroy the pile body of pile tube, can ensure pipe pile integrity, guarantee construction quality.
The present invention install convenient, cost is lower, safety is high, solves the various problems existed in Conventional attachment methods, such as the present invention be used for pullout tests time, instead of " core process filled out by joint bar ", the object reach the reduction of erection time, reducing costs; And during for compression test, " anchored pile-testing method " replacement " accumulation load method " using engineering pile as anchoring pile, eliminates the potential safety hazard that " accumulation load method " exists, and the process of the test time greatly shorten.
(4) when the present invention is used for compression test, adopt " anchored pile-testing method ", the use cost of " anchored pile-testing method " middle cross beam counterforce device is low, efficiency is high, therefore the present invention maintains the advantage of " anchored pile-testing method ", and solve the problem cannot determining the loading counterforce device of applicable engineer applied and the method for attachment of pile tube that " anchored pile-testing method " exist, provide technical support for realizing " anchored pile-testing method " extensive use in compression test.
(5) structure of the present invention is simple, practical, requires low, be applicable in the test occasion of various geological conditions, narrow space, broken the limitation that " accumulation load method " is applied to test site test site.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the structure chart of the fixture of test connecting device of the present invention;
Fig. 2 is the structure chart of test connecting device of the present invention clamping pile tube;
Fig. 3 is the structure chart of the embodiment of the present invention 1;
Fig. 4 is the schematic top plan view of the embodiment of the present invention 2;
Fig. 5 is the A direction view of Fig. 4;
Fig. 6 be test pile tube, anchoring pile and girder in the embodiment of the present invention 2, secondary beam arranges schematic top plan view.
Detailed description of the invention
Embodiment 1
As shown in Figures 1 to 3, it is a kind of pile tube Vertical Static Loading Test of the present invention linkage, it forms primarily of vertical connecting rod and the fixture 2 for grip tube pile head, the lower end of connecting rod 1 is connected on fixture 2, the upper end of connecting rod is for being connected to the loading counterforce device be positioned at above pile tube, in pullout tests, pile tube is test pile tube 3, to be passed to by uplift force to test pile tube 3 by the friction force between fixture 2 and test pile tube 3.
Connecting rod and fixture 2, load counterforce device 4 and be all connected by detachable syndeton.Detachable syndeton is screw connection structure, connecting rod adopts screw rod, the tubular dop that fixture 2 is sleeved on test pile tube primarily of close fitting forms with the otic placode 22 be located on dop outer wall, screw connection structure between screw rod and fixture comprises the screw be opened on otic placode 22 and the screw thread being positioned at screw rod lower end, and the lower end of screw rod forms connecting bolt 80 through after screw by nut is fixing.In the present embodiment, tubular dop is docked by two and half cylindrical shells 21,23 and forms, the interface of two and half cylindrical shells has overhanging flank 24 respectively, flank 24 is plate body and length direction along half cylindrical shell extends, and the plate face of flank 24 has corresponding screw and form pile holder bolt 25 by nut is fixing after passing for bolt.The internal diameter of tubular dop is identical with test pile tube external diameter, with the close contact of guarantee test pile tube and tubular dop, pile holder bolt 25 is when connection two and half cylindrical shell, frictional force can be formed on the contact surface of the two, balance with this uplift force that screw rod applies fixture, and uplift force is reached the pile crown of test pile tube.
Use a pilot system for above-mentioned pile tube Vertical Static Loading Test linkage, comprise above-mentioned pile tube Vertical Static Loading Test linkage and load counterforce device 4; In pullout tests, uplift force is passed to and tests pile tube 3 with loading counterforce device 4 by test connecting device joint test pile tube 3.In the present embodiment, load counterforce device and comprise buttress, girder 5, loading blocks 6 and short beam 7, lift-up device adopts jack 8, girder 5 across test pile tube 3 above and its two ends are positioned on buttress, for placing jack 8 and making it be in directly over test pile tube 3 on girder 5, loading blocks 6 and short beam 7 are superimposed on the end face of jack 8 from bottom to top successively, the external part that loading blocks 6 becomes short beam 7 is stretched out at the two ends of short beam 7 respectively, and the external part of short beam 7 is connected with test connecting device to realize loading counterforce device and the connection testing pile tube.
In certain engineering, general condition of engineering geology: engineering geology is primarily of compositions such as plain fill, flour sand, silt, completely decomposed mud stone, intense weathering munstone, middle weathered mudstones.Basis adopts the prestressed concrete pipe pile of stake footpath Φ 500, and designing pile length is 9 ~ 47 meters, and uplift bearing capacity design load is 350kN, and maximum trial load is the twice of uplift bearing capacity design load, is 700kN, and the stake long of test pile tube is 38 meters.
Adopt above-mentioned pilot system to carry out pullout tests, the method specifically comprises the following steps:
(1) with 1.2 of maximum trial load times, the uplift resistance testing pile tube is checked, according to checking computation results Selection experiment linkage, namely select connecting bolt and pile holder bolt; Now, the maximum trial load of test connecting device of the present invention is 700kN, pile holder bolt and connecting bolt is carried out to the checking computations of bearing capacity, chooses the pile holder bolt of 8.8 grades of M36 × 320 and the connecting bolt of 8.8 grades of M39 × 3000;
(2) fixture close fitting is sleeved on the pile crown of test pile tube; Two and half cylindrical shells are by the circular fixture of eight pile holder bolts 25 anchor connection, to provide enough anchored force, pile crown is clamped, the pile crown of clamping test pile tube under torque wrench instrument control system, fixture diameter is 500mm, be highly 450mm, quality is 0.45t, and the fastening torque of each pile holder bolt is 1764Nm;
(3) loading counterforce device adopts natural ground to provide end reaction, namely as buttress, buttress lifts girder, make it across the top being arranged on test pile tube, use hydraulic jack hierarchical loading during test, jack is placed on girder, and is positioned at directly over test pile tube;
(4) on the end face of jack, place loading blocks, then in loading blocks two short beams placed side by side, the external part that loading blocks becomes short beam is stretched out at the two ends of short beam, and the external part of short beam is positioned at directly over otic placode;
(5) use the external part of screw rod jockey and short beam and be fixed, specifically in the otic placode of circular clamp, insert four screw rods, by four screw rods, the external part of fixture with two short beams loading counterforce device is connected, forms connecting bolt with bolt anchoring, pilot system installation; The fastening torque of each connecting bolt is 2156Nm; Now, the center of the center of girder, the end face center of jack, loading blocks and the axis of test pile tube are all located along the same line, and to ensure that screw rod is subject to uniform uplift force, make experimental data more accurate;
(6) operate jack, test connecting device be evenly subject to uplift force and power transmission to testing pile tube, developmental tube pile is put to the test required maximum trial load.
Embodiment 2
As shown in figures 4-6, the difference of the present embodiment and embodiment 1 is: pile tube Vertical Static Loading Test linkage is applicable to compression test, the test connecting device of the present embodiment pilot system connects anchoring pile and loads counterforce device to provide counter-force proportionality action in testing pile tube, and pile tube comprises test pile tube 10 and at least two and is positioned at the anchoring pile 11 of test pile tube 10 periphery to symmetry.
Load counterforce device and comprise girder 5, secondary beam 20, loading blocks 60 and short beam 7, for placing jack 8 on the end face of test pile tube 10, girder 5 is across the top of test pile tube 10 and is pressed on jack 8, secondary beam 20 is to be located at directly over anchoring pile 11 perpendicular to the direction of girder 5, then be pressed in the middle part of secondary beam 20 on girder 5, short beam 7 is placed on secondary beam 20 by loading blocks 60, the external part that secondary beam 20 becomes short beam 7 is stretched out at the two ends of short beam 7 respectively, and the external part of short beam 7 is connected the connection realizing loading counterforce device and anchoring pile with test connecting device.
In certain engineering, general condition of engineering geology: primarily of banketing, mud, silty clay, mucky soil, Extra-fine sand, remain the compositions such as sand, intense weathering munstone, middle weathered mudstone, micro-weathered mudstone; Basis adopts the pile for prestressed pipe of stake footpath Φ 500, and designing pile length is 7 ~ 20 meters, and Compressive Bearing Capacity of Single Pile design load is 2000kN, and maximum trial load is 4000kN, and the stake long of test pile tube is 15 meters.Because Pile side soil mostly is mud, bottom is intense weathering munstone, and test site is narrow foundation ditch, cannot carry out accumulation load method single pile compression dead load test.
Above-mentioned pilot system carries out compression test, specifically comprises the following steps:
(1) with 1.2 of maximum trial load times, anchoring pile is chosen according to construction plant condition, determine the design uplift resistance of every root anchoring pile, and the uplift resistance of anchoring pile is checked, in the present embodiment, utilize 12 400mm stake footpath engineering piles symmetrical around test pile tube as anchoring pile 11, the anchoring pile 11 around test pile tube 10 is divided into three symmetrical row's anchoring piles by girder, four anchoring piles are drawn together in every package, and every root secondary beam 20 is arranged in above the anchoring pile 11 of identical row.Check the uplift resistance of anchoring pile 11 with 1.2 of maximum trial load times, 1.2 times of maximum trial load is 4800kN, then the design uplift resistance of every root anchoring pile 11 is 400kN.Anchoring pile 11 embedded depth is about 20 meters, and intense weathering munstone is at 16m depth, and anchoring pile enters intense weathering munstone and is about 4m.According to " technical code for building pile foundation " (JGJ 94-2008), if only count intense weathering munstone section collateral resistance, then anchoring pile CAPO test standard value is:
T
uk=Σ λ
iq
siku
il
i=0.5 × 160 × π × 0.4 × 4=402kN > 400kN, meets the demands.
With the maximum trial load 800kN of test connecting device (2 times of anchoring pile design uplift resistance), pile holder bolt and connecting bolt are carried out to the checking computations of bearing capacity, according to checking computation results Selection experiment linkage, namely the pile holder bolt of 8.8 grades of M36 × 320 and the connecting bolt of 8.8 grades of M39 × 3000 is chosen, the fastening torque of each pile holder bolt is 1764Nm, and the fastening torque of each connecting bolt is 2156Nm.
(2) be sleeved on the pile crown of anchoring pile by fixture close fitting, two and half cylindrical shells connect conglobate fixture by eight pile holder bolts, particular by eight pile holder bolt anchorings, are clamped by pile crown to provide enough anchored force; Under torque wrench instrument control system, clamp the pile crown of anchoring pile, fixture diameter is 400mm, is highly 450mm, and quality is 0.3t;
(3) jack is placed on the pile crown end face of test pile tube;
(4), see Fig. 4, at test pile tube periphery, reference pegs 40, datum line beam 70 are set, the displacement that reference pegs 40 and datum line beam 70 occur in process of the test for testing experiment pile tube; Lifting girder, girder across be arranged on test pile tube top and be pressed on jack, to be placed on girder by three secondary beams perpendicular to girder direction, and make anchoring pile be positioned at immediately below secondary beam, anchoring pile, test pile tube and girder, secondary beam arrange see Fig. 6;
(5) on the two ends and middle part of secondary beam, place loading blocks 60, two short beams placed side by side in loading blocks 60, the external part of loading blocks as short beam is stretched out at the two ends of short beam, and the external part of short beam is positioned at directly over otic placode;
In other embodiments, according to the concrete condition of test site, loading blocks can be added between jack and girder, be positioned in same level to make girder.
(6) use the external part of screw rod jockey and short beam and be fixed; Specifically in circular clamp, insert four screw rods, by these four screw rods, the external part of fixture with two short beams loading counterforce device is connected, bolt anchoring is adopted to form connecting bolt, realize fixture and the connection loading counterforce device, the equal joint test linkage of all anchoring piles, form reaction frame, pilot system installation; Now, the end face center of jack, the center of girder and test pile tube axis on the same line, to ensure that the test connecting device on anchoring pile is subject to uniform uplift force, and then the reaction frame that the anchoring pile be connected is formed provides uniform counter-force proportionality action in the pile body of test pile tube, makes experimental data more accurate;
(7) operate jack, the stressed jack-up of reaction frame, test connecting device is evenly subject to uplift force, anchoring pile counter-force is provided and proportionality action in test pile tube, and then under the effect of jack, developmental tube pile is put to the test required maximum trial load.
In anchored pile-testing method compression test, with 1.2 of maximum trial load times, the engineering pile choosing right quantity according to site condition is tested as anchoring pile, determines anchoring pile design uplift resistance, and checks anchoring pile uplift resistance (joint of foundation soil, stake); When adopting engineering pile as anchoring pile, anchoring pile quantity should not be less than 4, and monitor the amount of pulling out on anchoring pile, anchoring pile is symmetric to test centered by pile tube, the reaction frame of stress equalization can be formed, the determination about anchoring pile quantity and distributing position: first can select anchoring pile by empirical evaluation, then according to 1.2 times of maximum trial load, the uplift resistance of anchoring pile is checked, until checking computation results meets the demands, finally determine the quantity of anchoring pile.
Embodiments of the present invention are not limited thereto; according to foregoing of the present invention; according to ordinary technical knowledge and the customary means of this area; do not departing under the present invention's above-mentioned fundamental technics thought prerequisite; the present invention can also make the amendment of other various ways, replacement or change, all drops within rights protection scope of the present invention.
Claims (7)
1. a pile tube Vertical Static Loading Test linkage, it is characterized in that: it forms primarily of vertical connecting rod and the fixture for grip tube pile head, the lower end of described connecting rod is connected on described fixture, the upper end of described connecting rod is for being connected to the loading counterforce device be positioned at above pile tube, described in pullout tests, pile tube is test pile tube, by the friction force between fixture and test pile tube, uplift force is passed to test pile tube, or pile tube comprises test pile tube and at least two and is positioned to symmetry the anchoring pile testing pile tube periphery described in compression test, there is provided counter-force proportionality action in test pile tube by the friction force between fixture and anchoring pile, described connecting rod and described fixture, load counterforce device and be all connected by detachable syndeton, described detachable syndeton is screw connection structure, described fixture is sleeved on the tubular dop on tubular pile head primarily of close fitting and is located at the otic placode composition on dop outer wall, screw connection structure between described connecting rod and fixture comprises the screw be opened on described otic placode and the screw thread being located at described connecting rod lower end, and the lower end of described connecting rod forms connecting bolt through after described screw by nut is fixing.
2. pile tube Vertical Static Loading Test linkage according to claim 1, is characterized in that: described tubular dop is docked by two and half cylindrical shells and forms.
3. pile tube Vertical Static Loading Test linkage according to claim 2, it is characterized in that: on the interface of described two and half cylindrical shells, there is overhanging flank respectively, described flank is plate body and length direction along described half cylindrical shell extends, and the plate face of described flank has corresponding screw and form pile holder bolt by nut is fixing after passing for bolt.
4. use a pilot system for pile tube Vertical Static Loading Test linkage described in claim 1, it is characterized in that: comprise described pile tube Vertical Static Loading Test linkage and load counterforce device; In pullout tests, described test connecting device joint test pile tube with load counterforce device and uplift force is passed to test pile tube; Or in compression test, described test connecting device connect load counterforce device with at least two to be symmetrically distributed in test pile tube periphery anchoring pile to provide counter-force proportionality action in testing pile tube; Buttress, girder, loading blocks and short beam is comprised for the loading counterforce device in pullout tests, described girder is across above described test pile tube and its two ends are positioned on described buttress, for placing lift-up device and making it be in directly over test pile tube on described girder, described loading blocks and short beam are superimposed on the end face of described lift-up device from bottom to top successively, the external part that loading blocks becomes short beam is stretched out at the two ends of described short beam respectively, and the external part of described short beam is connected with described test connecting device to realize loading counterforce device and the connection testing pile tube.
5. use a pilot system for pile tube Vertical Static Loading Test linkage described in claim 1, it is characterized in that: comprise described pile tube Vertical Static Loading Test linkage and load counterforce device, in pullout tests, described test connecting device joint test pile tube with load counterforce device and uplift force is passed to test pile tube, or in compression test, described test connecting device connect load counterforce device with at least two to be symmetrically distributed in test pile tube periphery anchoring pile to provide counter-force proportionality action in testing pile tube, girder is comprised for the loading counterforce device in compression test, secondary beam and short beam, for placing lift-up device on the end face of described test pile tube, described girder is across the top of described test pile tube and is pressed on lift-up device, described secondary beam at least makes its two ends be positioned at directly over described anchoring pile with the direction perpendicular to girder, then be pressed on girder in the middle part of secondary beam, described short beam is placed on described secondary beam, the external part that secondary beam becomes short beam is stretched out at the two ends of described short beam respectively, the external part of described short beam is connected the connection realizing loading counterforce device and anchoring pile with described test connecting device.
6. a test method for pilot system described in claim 4, is characterized in that comprising the following steps:
(1) with 1.2 of maximum trial load times, the uplift resistance testing pile tube is checked, according to checking computation results Selection experiment linkage;
(2) the fixture close fitting of test connecting device is sleeved on the pile crown of test pile tube;
(3) lift girder, make it across the top being arranged on test pile tube, lift-up device is placed on girder, and be positioned at directly over test pile tube;
(4) on the end face of lift-up device, place loading blocks, then place short beam in loading blocks;
(5) the connecting rod jockey of service test linkage and the external part of short beam be fixed, pilot system installation;
(6) operate lift-up device, described test connecting device be evenly subject to uplift force and power transmission to testing pile tube, developmental tube pile is put to the test required maximum trial load.
7. a test method for pilot system described in claim 5, is characterized in that comprising the following steps:
(1) with 1.2 of maximum trial load times, choose anchoring pile according to construction plant condition, determine the design uplift resistance of every root anchoring pile, and the uplift resistance of anchoring pile is checked, according to checking computation results Selection experiment linkage;
(2) the fixture close fitting of test connecting device is sleeved on the pile crown of anchoring pile;
(3) lift-up device is placed on the end face of test pile tube;
(4) lift girder, make it across the top being arranged on test pile tube and be pressed on lift-up device, to be placed on girder by secondary beam perpendicular to girder direction, and making anchoring pile at least be positioned at immediately below secondary beam two ends;
(5) at least on the two ends of secondary beam, place short beam;
(6) the connecting rod jockey of service test linkage and the external part of short beam be fixed, forms reaction frame, pilot system installation;
(7) operate lift-up device, the stressed jack-up of reaction frame, test connecting device is evenly subject to uplift force, anchoring pile counter-force is provided and proportionality action in test pile tube, developmental tube pile is put to the test required maximum trial load.
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| CN103485374B (en) * | 2013-10-12 | 2017-02-08 | 中勘冶金勘察设计研究院有限责任公司 | Static load test anchor pile connecting structure |
| CN104328810B (en) * | 2014-11-07 | 2016-08-24 | 广州科技职业技术学院 | Prefabricated tubular pile single pile foundation bearing capacity detection improvement method |
| CN104563168A (en) * | 2014-12-09 | 2015-04-29 | 常州市安贞建设工程检测有限公司 | Multifunctional bend resistance and shear resistance device of prestressed concrete pipe pile |
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| CN106400852B (en) * | 2016-10-25 | 2018-05-25 | 佛山市禅城区建设工程质量安全检测站 | A kind of single pile vertical resistance pressure bearingtest method |
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| CN109235511B (en) * | 2018-11-09 | 2024-05-03 | 郑州大学 | Detachable tubular pile connecting device for tubular pile static load test and complete equipment |
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