Load box for self-balancing static load test
By setting a large-tonnage jack and a hollow top plate structure along the central axis of the load cell, the problems of uneven force application and complicated assembly of traditional load cells are solved, achieving accuracy and transportation convenience in static load testing, and making it suitable for large-tonnage test scenarios.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2026-04-10
AI Technical Summary
Traditional load cells are prone to uneven force application during use, which affects the accuracy of static load test data and the integrity of the pile body. In addition, they are cumbersome to assemble and inconvenient to transport, and cannot meet the needs of large-tonnage tests.
Design a load cell for self-balancing static load testing. It adopts a large-tonnage jack set along the central axis. The top and bottom plates are hollow structures, equipped with annular convex rails and grooves for easy assembly and installation. The jacks abut against the inner wall of the top plate to ensure uniform force application.
It achieves accuracy in static load test data and ensures the integrity of the pile body. Its simple structure facilitates transportation and assembly, improves test efficiency, and is suitable for large-tonnage test scenarios.
Smart Images
Figure CN224106485U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to building base pile equipment field, concretely relates to a load box for self -balancing static load test. BACKGROUND
[0002] In the field of construction engineering, pile foundation is a common foundation form, and the load box is a special loading device for the self-balancing method test of the bearing capacity of pile foundation in the construction industry. The traditional static load test method has limitations in special cases, for example, in the case of large-tonnage pile testing, water pile testing and the like, the heap loading method has problems such as difficulty in transporting heavy loads, large occupation of site, and the like, and the principle of the anchor pile method is to balance the load by using the reaction force of the pile body itself, the load box is placed at a specific position of the pile body, the pile body is loaded through the loading device, so as to test the bearing capacity and related mechanical properties of the pile, so that the test of the bearing capacity of the pile foundation can be completed efficiently and accurately without being limited by site, loading tonnage and many other conditions, but the anchor pile method has high requirements for the anchor pile, and once the pile head is damaged during the test, the test accuracy will be directly affected.
[0003] The commonly used traditional load box is a cylindrical load box composed of multiple small jacks, the jacks are arranged around the central axis in the traditional load box to form a hollow structure, although the static load test can be completed, the following problems exist when in use: (1) the combination between the traditional load boxes is complicated and can only be completed in the factory; (2) if the range of the load box does not meet the existing test conditions at the test site, the load box has to be returned to the factory for replacement, which affects the timeliness of the test; (3) during the operation of the traditional load box, some jacks of the load box may not work or have low work efficiency, so that the pile foundation is affected by uneven forces during the test, the center is not stressed and the periphery is stressed, the pile to be tested is affected by the eccentric distance and tensile stress is generated in the pile, which affects the data accuracy of the static load test on the one hand and causes cracks in the pile body and affects the integrity of the pile body on the other hand. UTILITY MODEL CONTENTS
[0004] The utility model provides a load box for self -balancing static load test, and aims at solving the problem that the traditional load box is prone to uneven force during use, thereby affecting the data accuracy of the static load test and the integrity of the pile body.
[0005] To achieve the purpose, the utility model adopts the following technical scheme:
[0006] The utility model provides a load box for self -balancing static load test, including load box body, the load box body includes the upper top plate and lower top plate respectively in top, bottom two ends, and the upper top plate and lower top plate are supported between through a plurality of equidistance support column provides support, is equipped with the jack along the central axis of load box body, and the upper, lower two ends of jack are respectively with the inner wall of upper top plate and lower top plate abuts, be equipped with annular convex track on the upper top plate, be equipped with annular groove on the lower top plate.
[0007] Further, the upper top plate and the lower top plate are identical in structure and are in a hollow shape.
[0008] Further, the annular convex track and the annular groove are matched.
[0009] Further, the tonnage of the jack is 1000-2000t.
[0010] Compared with the prior art, the utility model has the beneficial effects as follows:
[0011] 1. The load box for self-balancing static load test provided by the utility model is provided with a large-tonnage jack at the central axis of the load box body, which can meet the range requirement of static load test, avoid the uneven force caused by the non-working or low-efficiency working of part of the jacks in the load box, and ensure the accuracy of static load test data and the integrity of the pile body. The self-balancing load box of the application can be used in a site where anchor pile method and pile-up method cannot be used for static load test and a site where the test load is too large, thereby making up for the deficiency of traditional static load test.
[0012] 2. The load box for self-balancing static load test provided by the utility model is simple in structure, detachable, convenient to transport and carry, and provided with matched annular convex track and annular groove, which facilitates mutual combination and installation according to the requirement of the site and improves the test and detection efficiency.
[0013] 3. The load box for self-balancing static load test provided by the utility model is in a hollow shape, which is convenient for concrete pouring, has high practicability, and is supported by the support column between the upper top plate and the lower top plate, so that the load box body is stable and the jack can be easily forced. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a front view of the load box for self-balancing static load test of the utility model;
[0015] Figure 2 It is a plan view of the load box for self-balancing static load test of the utility model;
[0016] Figure 3 It is Figure 1 It is a sectional view along A-A;
[0017] In the figure: 1 - annular convex track; 2 - jack; 3 - upper top plate; 4 - support column; 5 - annular groove; 6 - lower top plate. DETAILED DESCRIPTION
[0018] The utility model will be further described below in combination with the drawings:
[0019] As Figures 1-3 shown, the utility model discloses a load box for self-balancing static load test, including load box body, the load box body includes the upper top plate 3 and lower top plate 6 of top, bottom two ends respectively are equipped with, the upper top plate 3 and lower top plate 6 are supported between through four equidistance settings support column 4 provide support, and support column 4 is steel structure, can guarantee the overall stability of load box body 1, facilitate jack 2 force, guarantee test smoothly carry out. Along the central axis of load box body is equipped with 1000t jack 2, and the upper and lower ends of jack 2 are respectively with the inner wall of upper top plate 3 and lower top plate 6 abut, and the structure of upper top plate 3 and lower top plate 6 is same, all are circular and present openwork. Annular convex track 1 is equipped on the upper top plate 3, and annular groove 5 is equipped on the lower top plate 6 and is matched with annular convex track 1, and the mutual combination of several load box bodies 1 is convenient.
[0020] Before static load test uses the load box for self-balancing static load test of the application, first checks the load box body intact, can normally work, then connect the load box body and steel reinforcement cage, specifically is the longitudinal reinforcement of steel reinforcement cage is passed through the openwork upper top plate 3 and lower top plate 6 of load box body, then firmly welds on the upper top plate 3 and lower top plate 6 of steel reinforcement cage. If the load provided by a load box body does not satisfy the bearing capacity required by the test, two or more load box bodies can be spliced. When splicing the load box, first tightly connect the annular groove 5 of the lower top plate 6 in the upper load box body with the annular convex track 1 of the upper top plate 3 in the lower load box body, then weld the lower top plate 6 of the upper load box body and the upper top plate 3 of the lower load box body, and finally weld and fix the steel reinforcement cage.
[0021] After the load box body and the steel reinforcement cage are welded, the load box body needs to be checked again to ensure that it is intact before it can be put into normal work and used for pouring concrete. During pouring, the concrete can be smoothly poured through the openwork upper top plate 3 and lower top plate 6, which will not affect the pouring of concrete below the load box body, and thus will not affect the integrity of the pile body. During vibrating the concrete, the vibrating rod can freely pass through the openwork upper top plate 3 and lower top plate 6, so that the concrete can be fully vibrated to improve the quality of the pile body concrete. During the static load test, the stress direction of the jack 2 is consistent with the central axis of the pile foundation, which avoids the problem of eccentric force of the load box body during the test, ensuring the accuracy of the static load test data and the integrity of the pile body.
Claims
1. A load box for self-balancing static load testing, characterized by: The load box body comprises an upper top plate (3) and a lower top plate (6) arranged at the top and bottom ends respectively, and the upper top plate (3) and the lower top plate (6) are supported by a plurality of equidistantly arranged support columns (4); a jack (2) is arranged along the central axis of the load box body, and the upper and lower ends of the jack (2) respectively abut against the inner walls of the upper top plate (3) and the lower top plate (6); an annular convex rail (1) is arranged on the upper top plate (3), and an annular groove (5) is arranged on the lower top plate (6).
2. The load box for self-balancing static load testing according to claim 1, characterized in that: The upper top plate (3) and the lower top plate (6) have the same structure and are both hollow.
3. The load box for self-balancing static load testing of claim 2, wherein: The annular convex rail (1) and the annular groove (5) are matched.
4. The load box for self-balancing static load testing according to any one of claims 1 to 3, characterized in that: The tonnage of the jack (2) is 1000-2000t.