CN210342029U

CN210342029U - Horizontal tension applying device suitable for horizontal static load test of large-pile-interval pile foundation

Info

Publication number: CN210342029U
Application number: CN201921260993.0U
Authority: CN
Inventors: 周立国; 蒯振亚; 许庆伟; 张明瑞; 马克刚; 禹峰; 汪志涛; 朱小丹; 杨锋; 路辉
Original assignee: China Energy Engineering Group Anhui Electric Power Design Institute Co Ltd
Current assignee: China Energy Engineering Group Anhui Electric Power Design Institute Co Ltd
Priority date: 2019-08-06
Filing date: 2019-08-06
Publication date: 2020-04-17
Anticipated expiration: 2029-08-06

Abstract

The utility model relates to a horizontal tension applying device suitable for a horizontal static load test of a pile foundation with a large pile spacing, which comprises a jack, a first pull disc arranged at the front end of the jack, a second pull disc arranged at the rear end of the jack, a first tension assembly arranged on the first pull disc and a second tension assembly arranged on the second pull disc; the first tension assembly comprises a first steel wire rope, and a first length-adjustable pull rod and a second length-adjustable pull rod which respectively connect two ends of the first steel wire rope to the first pull disc; the second tension assembly comprises a second steel wire rope, and two ends of the second steel wire rope are connected to the second pull disc respectively. Compared with the prior art, the utility model discloses in the horizontal static load test of big pile interval pile foundation, have dependable performance, equipment light, easily installation, practical pile interval change condition advantage such as wide.

Description

Horizontal tension applying device suitable for horizontal static load test of large-pile-interval pile foundation

Technical Field

The utility model relates to a pile foundation horizontal static load test technical field, concretely relates to horizontal pulling force applying device suitable for horizontal static load test of pile foundation of large pile spacing.

Background

The horizontal static load test of pile foundation is one of the static load test methods commonly used in pile foundation test and pile foundation detection. The device capable of applying (releasing) quantitative horizontal force to the test piles in stages according to the test requirements is one of the main test devices indispensable to the test. Whether the horizontal force applying device can be reasonably constructed and effectively used or not is directly related to whether the test can be successfully completed or not and the test cost is related. In the horizontal static load test work of the pile foundation, when the horizontal static load test of long pile spacing (the distance between two pile cores and the pile core is more than 10 times of the pile diameter), the common horizontal force applying method comprises the following steps: the main working principle of the method is to control a jack to provide horizontal thrust for a test pile.

The traditional method used in the existing long pile spacing pile foundation horizontal test has the following problems and disadvantages: (1) the equipment is much prepared and heavy and installation is difficult. If the 'lengthened jacking pipe method' is used, jacking pipes with various length specifications and sufficient strength and rigidity are prepared according to tests of different pile spacing. This not only adds expense to the transport of the tubing, but also adds difficulty to the trial installation due to the bulkiness of the tubing. (2) The efficiency is reduced and the cost is increased. The anchor pile method is used for testing, and the test that two piles can be simultaneously carried out each time is changed into the test that one pile is carried out each time, so that the test working efficiency is reduced; and moreover, the anchor piles are additionally constructed, so that the engineering cost is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a horizontal pulling force applying device suitable for big pile interval pile foundation level static load test, this horizontal pulling force applying device can solve exist among the prior art not enough, has characteristics such as dependable performance, equipment are light, easily installation, application scope are wide.

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

the horizontal tension applying device suitable for the horizontal static load test of the pile foundation with the large pile spacing comprises a jack, a first pull disc arranged at the front end of the jack, a second pull disc arranged at the rear end of the jack, a first tension assembly arranged on the first pull disc and a second tension assembly arranged on the second pull disc; the first tension assembly comprises a first steel wire rope, and a first length-adjustable pull rod and a second length-adjustable pull rod which respectively connect two ends of the first steel wire rope to the first pull disc; the second tension assembly comprises a second steel wire rope, and two ends of the second steel wire rope are connected to the second pull disc respectively.

Further, the jack comprises a jack body and a jack piston arranged at the front end of the jack body; a force measuring sensor is arranged on the jack piston; the first pull disc is installed on the force measuring sensor.

Furthermore, the first pull rod and the second pull rod have the same structure and respectively comprise a pull rod main body, a spiral telescopic piece and a connecting bayonet which are sequentially connected; the spiral telescopic piece comprises a first adjusting piece and a second adjusting piece which are in threaded connection; the first adjusting piece is provided with external threads, and the second adjusting piece is provided with internal threads.

Furthermore, one end of the first steel wire rope is provided with a first rope fastener connected with a connecting bayonet of the first pull rod, and the other end of the first steel wire rope is provided with a second rope fastener connected with a connecting bayonet of the second pull rod; and the rope buckle II is provided with a steel wire rope clamp for adjusting the length of the steel wire rope I.

Furthermore, the front ends of the first pull rod and the second pull rod are fixed on the first pull disc through pin shafts.

Further, a hanging groove is formed in the second pull disc; two ends of the second steel wire rope are respectively provided with a third rope fastener, and the third rope fastener is fixed in the hanging groove.

Compared with the prior art, the utility model has the advantages that:

(1) horizontal pulling force exerting device, the complete equipment is light, easily install, be convenient for transport.

(2) Along with the stake interval change, the utility model discloses only need adjust the steel wire rope card chucking position just can satisfy experimental demand, it is wide to be suitable for stake interval change scope.

(3) Compare in traditional anchor pile method, the utility model has the advantages of efficient and cost-effective.

(4) The utility model provides a wire rope one and wire rope two have the cushioning effect in loading process, make experimental loading softer, stable more.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Wherein:

1. the test pile comprises a first test pile, a second test pile, steel wire ropes, 3, first pull discs, 4, a force measuring sensor, 5, a jack piston, 6, a jack body, 7, second pull discs, 8, first pull rods, 9, second pull rods, 10, a spiral telescopic piece, 11, a connecting bayonet, 12, first steel wire ropes, 13, steel wire rope clamps, 14, second test pile, 15 foundation pit edges, 16 and a pin shaft.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

the horizontal tension applying device suitable for the horizontal static load test of the pile foundation with the large pile spacing shown in the figure 1 comprises a jack, a first pull disc 3 installed at the front end of the jack, a second pull disc 7 installed at the rear end of the jack, a first tension assembly installed on the first pull disc 3 and a second tension assembly installed on the second pull disc 7. The first tension component comprises a first steel wire rope 12 and a first length-adjustable pull rod 8 and a second length-adjustable pull rod 9 which are used for respectively connecting two ends of the first steel wire rope 12 to the first pull disc 3. The second tension component comprises a second steel wire rope 2, and two ends of the second steel wire rope 2 are connected to the second pull disc 7 respectively. The utility model relates to a horizontal pulling force applying device suitable for horizontal static load test of big pile interval pile foundation, the device through set up two at the jack both ends and draw the dish, parts such as reuse wire rope, pull rod will two draw the dish and two experimental pile bodies are connected according to certain method, make the horizontal thrust of jack output, equivalent converts the horizontal pulling force of applying on two experimental pile bodies into. As can be seen from fig. 1, the tension assembly extends from the front end of the jack to the second test pile 14 on the rear side of the jack; and the tension component II extends from the rear end of the jack to the test pile I1 positioned on the front side of the jack. The first tension component and the second tension component are partially staggered.

Further, the jack comprises a jack body 6 and a jack piston 5 arranged at the front end of the jack body 6; the jack piston 5 is provided with a force measuring sensor 4; the pull disc I3 is arranged on the load cell 4.

Further, the first pull rod 8 and the second pull rod 9 have the same structure and respectively comprise a pull rod main body, a spiral telescopic piece 10 and a connecting bayonet 11 which are sequentially connected. The spiral telescopic piece 10 comprises a first adjusting piece and a second adjusting piece which are in threaded connection. The first adjusting piece is provided with external threads, and the second adjusting piece is provided with internal threads. External screw thread on the adjusting part one suits with the internal thread on the adjusting part, and the two is in the same place through external screw thread and female connection to through rotatory adjusting part one and adjusting part two, can change the length of whole spiral extensible member, thereby make the utility model discloses certain pretightning force has. The connecting bayonet is used for fixing a rope buckle of the first steel wire rope.

Furthermore, one end of the first steel wire rope 12 is provided with a first rope fastener connected with a connecting bayonet of the first pull rod 8, and the other end of the first steel wire rope is provided with a second rope fastener connected with a connecting bayonet of the second pull rod 9; and a steel wire rope clamp 13 for adjusting the length of the steel wire rope I is arranged on the rope buckle II. The steel wire rope clamp adopts a U-shaped rope clamp. The steel wire rope clamp is used for fixing the redundant part of the steel wire rope I into a rope buckle, and the using length of the steel wire rope I is adjusted by adjusting the clamping position of the steel wire rope clamp.

Furthermore, the front ends of the first pull rod 8 and the second pull rod 9 are fixed on the first pull disc 3 through a pin shaft 16.

Further, a hanging groove is formed in the second pull disc 7; two ends of the second steel wire rope 2 are respectively provided with a third rope fastener, and the third rope fastener is fixed in the hanging groove.

The utility model discloses a concrete application method does:

(1) and excavating the soil around the test piles and the soil between the test piles of the first test pile 1 and the second test pile 14 to the depth required by the test and leveling. Reference numeral 1 in fig. 1 denotes an excavated pit edge of the foundation pit. The first test pile 1 is located on the front side of the jack, and the second test pile 14 is located on the rear side of the jack.

(2) And after the second steel wire rope 2 bypasses the first test pile 1, rope buckles at two ends of the second steel wire rope are hung in hanging grooves of the second pull disc 7, so that the end part of the second steel wire rope 2 is fixedly connected to the second pull disc 7.

(3) And (3) seating the bottom of the jack body 6 (transversely arranged) on the pull disc II 7, wherein the jack piston 5 is in a retraction state, and sequentially installing the force measuring sensor 4 and the pull disc I3 at the end of the jack piston.

(3) The first pull rod 8 and the second pull rod 9 are respectively connected with the first pull disc 3 by two pin shafts 16 according to the figure 1, and the spiral expansion piece 10 is adjusted to ensure that the first pull rod 8 and the second pull rod 9 are in a state of being as long as possible.

(4) One end of the first steel wire rope 12 provided with the first rope buckle is connected to the connecting bayonet 11 of the first pull rod 8, and the other end of the first steel wire rope 12 is connected with the connecting bayonet 11 on the second pull rod 9 after bypassing the second test pile 14. In the process of connecting with the connecting bayonet 11 on the second pull rod 9, the length of the actually required first steel wire rope 12 is measured, a part of the redundant first steel wire rope 12 is turned over, the first steel wire rope is clamped by the steel wire rope clamp 13 to form a second rope buckle, and then the second rope buckle is connected with the connecting bayonet 11 on the second pull rod 9.

(5) Adjusting the position of the component, so that the pull disc I3, the force measuring sensor 4, the jack, the pull rod I8, the pull rod II steel wire rope I12 and the steel wire rope II 2 are symmetrical about a connecting line in the pile core connecting line direction of the test pile I1 and the test pile II 14; the test stressed cross section of the first test pile 1, the stressed cross section of the second test pile 14, and the stressed centers of the first pull disc 3, the second pull disc 7, the force measuring sensor 4 and the jack are positioned on a horizontal section.

(6) And the spiral expansion pieces of the first pull rod 8 and the second pull rod 9 are rotated to contract the first pull rod 8 and the second pull rod 9, so that the system has a certain pretightening force which is less than 1% of the maximum load of the pre-estimation test.

The utility model discloses a theory of operation does:

as shown in fig. 1, the first steel wire rope 12 is sleeved on the second test pile 14 to cover the second test pile 14 in half. Two ends of the second steel wire rope 12 are connected to the first pull disc 3 through a first pull rod 8 and a second pull rod 9 respectively. The pull disc I3 is arranged in front of a force measuring sensor 4 at the front end (piston end) of the jack. The front ends of the first pull rod 8 and the second pull rod 9 are respectively fixed on the first pull disc 3 through a pin shaft 16. And a second steel wire rope 2 is sleeved on the first test pile 1 to wrap half of the first test pile 1. Two ends of the second steel wire rope 2 are connected to a second pull disc 7 positioned at the bottom end of the jack body. Through the connection, the piston extends outwards under the action of oil pressure in the lower cavity of the jack, and the generated action (pushing) force (the force direction is consistent with the extending direction of the piston) is transmitted to the second test pile 14 through the first pull disc 3, the first pull rod 8, the second pull rod 9 and the first steel wire rope 12, so that horizontal pulling force with the same magnitude and the opposite direction as the action (pushing) force of the jack is formed on the second test pile 14. Meanwhile, the reaction (pushing) force (the direction of the force is opposite to the extending direction of the piston) at the base end of the jack is transmitted to the test pile I1 through the pull disc II 7 and the steel wire rope II 2, the test pile I1 is subjected to horizontal pulling force, the magnitude of the horizontal pulling force is equal to the action (pushing) force and the reaction (pushing) force, and the direction of the horizontal pulling force is opposite to the direction of the reaction (pushing) force. The loading requirement of the horizontal static load test of the pile foundation on two test piles is met. On the contrary, when the oil pressure in the lower cavity of the jack is released and the piston retracts, the horizontal tension applied to the two test piles disappears, and the unloading requirement of the pile foundation horizontal static load test is met. When in use, the utility model realizes the effects of applying horizontal tension and releasing horizontal tension to the first test pile and the second test pile through the pressurization and the pressure release of the lower oil cavity of the jack; and then the automatic loading and load control of the test are realized by the force transducer and the automatic measurement and control instrument and the hydraulic pump station.

The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.

Claims

1. Horizontal pulling force applying device suitable for horizontal static load test of large pile spacing pile foundation, its characterized in that: the lifting jack comprises a jack, a first pull disc arranged at the front end of the jack, a second pull disc arranged at the rear end of the jack, a first pull assembly arranged on the first pull disc and a second pull assembly arranged on the second pull disc; the first tension assembly comprises a first steel wire rope, and a first length-adjustable pull rod and a second length-adjustable pull rod which respectively connect two ends of the first steel wire rope to the first pull disc; the second tension assembly comprises a second steel wire rope, and two ends of the second steel wire rope are connected to the second pull disc respectively.

2. The horizontal tension applying device suitable for the horizontal static load test of the large-pile-pitch pile foundation according to claim 1, is characterized in that: the jack comprises a jack body and a jack piston arranged at the front end of the jack body; a force measuring sensor is arranged on the jack piston; the first pull disc is installed on the force measuring sensor.

3. The horizontal tension applying device suitable for the horizontal static load test of the large-pile-pitch pile foundation according to claim 1, is characterized in that: the first pull rod and the second pull rod are identical in structure and respectively comprise a pull rod main body, a spiral telescopic piece and a connecting bayonet which are sequentially connected; the spiral telescopic piece comprises a first adjusting piece and a second adjusting piece which are in threaded connection; the first adjusting piece is provided with external threads, and the second adjusting piece is provided with internal threads.

4. The horizontal tension applying device suitable for the horizontal static load test of the large-pile-pitch pile foundation according to claim 3, is characterized in that: one end of the first steel wire rope is provided with a first rope fastener connected with the connecting bayonet of the first pull rod, and the other end of the first steel wire rope is provided with a second rope fastener connected with the connecting bayonet of the second pull rod; and the rope buckle II is provided with a steel wire rope clamp for adjusting the length of the steel wire rope I.

5. The horizontal tension applying device suitable for the horizontal static load test of the large-pile-pitch pile foundation according to claim 1, is characterized in that: the front ends of the first pull rod and the second pull rod are fixed on the first pull disc through pin shafts.

6. The horizontal tension applying device suitable for the horizontal static load test of the large-pile-pitch pile foundation according to claim 1, is characterized in that: a hanging groove is formed in the second pull disc; two ends of the second steel wire rope are respectively provided with a third rope fastener, and the third rope fastener is fixed in the hanging groove.